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Hi, Randy - great review. Could you be more specific on which Sony amp/receiver you’re comparing these to? Just curious to take a deeper dive on the specs. Cheers 🍻
Hi Randy,as i know the fosi BT20A Pro amp before it's even listed it shows 472 ratings which they replaced an old product with this one,but AIYIMA A07 and Pro are the product real review so I really like the AIYIMA products,Because this is a authentic product evaluation
According to my audiophile friend, A07 Pro does sound with a little more mid-range clarity & emphasis. If you'd like the sound signature with a little more bass & treble presence, A08 Pro may be a better fit to your liking. As for 5 swappable OP amp chips, roughly speaking: 1. the front right one is for input buffering and amplification, 2. the front left one is for bass & treble tone controls, 3. the middle left one is for single-ended to differential conversion of the left channel, 4. the middle right one is for single-ended to differential conversion of the right channel, (We'd better use the same model of OP amps for left and right channels at the same time I guess.) 5. and the rear one is for aux output buffering. Further fine-tuning its sound signature to your liking may be possible since you get FIVE swappable OP amps instead of TWO. Now it's your turn to play around with the OP amp rolling stuff if you'd like, have fun & happy rolling ;)
@@ynstyne You can buy OP amps from Digikey or Mouser, for example. There're lots of discussions on sound signature difference of various OP amps. Pull the trigger based on your own research & preference to give it a try. Many people prefer Muses 02, to name one. There are five NE5532 OP amps socketed inside when you buy a brand new Aiyima A07 Pro as far as I know. Those five are the same, and most OP amps are compatible regarding what you concerned.
Thanks to you Randy, i bought Aiyima A07 Pro with Aiyima T6 pro preamplifier. Hooked up with Kanto Yu Passive 5.25 or Kanto YUP 6 , and i connected my subwoofer Eris Sub 8 with high low converter , so not using the 3.5 mm jack for sub. The sound is extremely good , detailed and it gets loud loud ! I am very happy with the sistem i got . Maybe later on, will change some opamps, but for now is everything one could desire. I had previously, Logitesc , Edifier 2.1 sistems. This combination of mine is smoking everything i had before for pc sistem . Dont get me wrong , i have in my main room 7.1 with tower Canton speakers, so i can make a comparison. Really good sounding this Aiyima ! Thanks Randy and continue the good work, because of you i found out i can have a very spectacular audio sistem and not go bankrupt 😂
A Difference between the Aiyima and Fosi that can be very important to some: The Aiyima has a Bluetooth/Aux Switch on the front. The Fosi has no physical switch, it defaults to Bluetooth when anyone connects and the Bluetooth is searching for a signal at all times when its on. If you live in a dorm, apartment, condo, ANYONE can Hijack your audio, and depending on your settings, it can happen at a much louder volume. I do not like anyone in the vicinity having this control, there is no way to disable the Bluetooth. I see that you can un-pair a hi-jack by pressing and holding the volume knob...but that only works after the hi-jack has happened. There is a new Fosi V3 coming out with no Bluetooth...that is the one for me.
Exactly this! I contacted fosi to address this problem. They do nothing with it.. Ayima's physical switch is awesome. I use the a03 a lot, because it powers passive subs. The fosi bt10&20 I use for portable builds
I've been building speakers over 20 years and used many of the original A07 since it came out in 2020. I have a pair of 6 Inch 2 way speakers in my shop that use an 8 ohm SB acoustics woofer and are a nominal 6 ohm load. Switching to a 48 volt power supply on the A07 with these speakers is night and day, not a subtle effect at all. You'll still notice it with 4 ohm speakers, but if you really want to hear a difference in the bass and are running 6 to 8 ohm speakers, I highly suggest you try a 48 volt power supply to really hear the magic these amps can produce. I have never experienced any problems with the amp getting hot either.
@@tobiasschnitzer1449 Hi Tobias, I thought I replied to your question a few days ago but apparently it didn't stick. I prefer fanless meanwell ps with power factor correction, but you can just try out a cheap brick to observe the differences for yourself. Loud is not my thing, this is about an amplifier's ability to instantaneously deliver power through a given resistance. The reason car audio uses 4ohm drivers (and in the age of digital amps 2 or even 1ohm) is because a 12volt system is limited in the amount of power it can deliver through an 8ohm load. Without getting into damping factor and a bunch of electrical engineering lingo, let's just say that the voltage is the electrical equivalent of pressure, and the higher it is, the more easily it can drive through a higher resistance load. This is especially noticeable in bass transients and gives life to the music no matter what level you are listening at. Particularly if you are using speakers with highish resistance and low sensitivity. Volts x amps = watts, and a voltage controlled system runs cooler than a current controlled system. If you up the volts you can go with less amperage and maintain the same wattage. The 3255 chip specs show a max voltage of 53.5 and stereo wattage of 315, but the amp design for the A07 indicates 48v and at least 7.5amps, giving 360 watts. However, I think 5 or 6 amps is more than you'll ever need unless you're one of "those" listeners, which I am not unless inebriated lol Enjoy the experiments!
I dig my Aiyima A07 Pro pretty good for 2 channel. You can connect the A07 Pro to the original A07 TPA3255 with a aux 3.5mm for even more power. Which is pretty cool if wanted. I switch back and forth to my Yamaha RX-A820 Aventage receiver and Emotiva BasX 3 channel amp. Aiyima makes a good product.
The Hi-Fi world really has changed ! Aiyima A07 Pro (36V) connected to a Wiim Mini and Dali Oberon 3 speakers + Mivoc Sub was the perfect choice for me ! A07 Pro sounds much clearer and with more sparkle than all my expensive A & A/B amps from the past (Marantz, Technics, Kenwood, Yamaha) I can only recommend it to everyone who loves perfect music...
I have some expensive amps from sansui, onkyo, technics etc, but I dont think they sound perfect, They are big and heavy, do you think that one of these little modern amps are better than old vintage amps? I want clear crisp sound, the power does not matter for me, I just want to hear clear audio on my room without annoy my neighbors.
@@ChengGaos I understand. Then do yourself a favour and give the A07 Pro a chance. Trust me you won't regnet it. Grab one and tell me about it afterwards...
I much preferred the sound of my original $55 Ayima A07 to my $1,000 Emotiva XPA-5 Gen 2 if anyone can believe it. The Emo sounded too forward, the Ayima is an absolute steal for the price
I bought an Aiyima T9 for my son's first system last November. Sounds pretty damn good! I have a little system in the garage/workshop being driven by a $45 Pyle class D amp. I bought in 21 and figured why not for the garage. I hadn't started watching this channel yet. So I picked up an Aiyima A07 Pro based off of this video and holy crap! Two amps under $100 and they couldn't be more different. I'm driving some Infinity bookshelf speakers that were surrounds before and I'm amazed. I know the Pyle amp is really, really cheap but I didn't expect another sub $100 amp to make it seem disposable.
@KonradSkowronski hard to say off the top of my head as I haven't tried them on the same speakers yet. The T9 is paired with Kilpsch and the A07 with Infinty. I know the T9 can drive the Klipsch so loud I can hear them outside despite the system being in an insulated basement. I will say the soundstage is pretty remarkable in the A07.
@@tmdillon1969 Thanks for reply. I already have SMSL DA-9 but need another little amp for another room and I am thorn between T9 and A07 (or A07 Pro wich apparently sounds very different). If you have a chance to compare these two on sam speakers please let me know what you think :)
Listening to this video on my shiny new A07 Pro. Couldn't be happier with my 80$ purchase. BTW, mine came with a 36V 6A power supply. Really makes my RP 160m speakers shine compared to my old Sony Stereo receiver. I had no idea such great sound could be had for so little money. Losing the left channel on my old receiver really was a blessing in disguise!
Well, if you want the bottom end rocking rocking and better than the Fosi...the most important are the 2 in the middle swapping to opa2604...2 opa627 in the front and in the back 1 opa445bm, will sound really really good and you can make sound the way you want and even sound like a different amplifier by just moving the tone control everyday
Hi, do you know which op amps are for individual outputs. Which is blue tooth, which is rca? What's the 5th one for? Is it for the 3.5mm jack? Also, have you noticed that if you use Bluetooth, it sounds great, but the rca's are lackluster? At least on mine. Interested in what you think, as I love the 2604s. Right now, I'm running 649sa in an a07. They sound great but can be too detailed and can ruin certain songs as you hear things you can't with anything else. I'm hoping someone can tell me what each op amp is for in the pro so I can set it up right. I'm running my sub on the 3.5mm output and would love to make that a 2604. Any knowledge would be appreciated as I'm knew to this.
@@kittykatking7882 I don't think that there is a specific opamp for bluetooth or rca, 2 in the middle feed the tpa3255, not sure if 2 at front are for tone control and the last maybe for voltage regulator...I have tried 5 opa1656 mehh, lme49860 mehh, muses02 but none of those improved sound in any position, like the one I mentioned in prior comment. Also didn't tried any expensive SS3602 or Spakos labs, I would let someone to try those and compare to my suggestions.
@@joelcarson4602 good reason to be CAREFUL when playing around on the inside of these devices. Better to unplug them and let them sit for a day or two and let the capacitors discharge before touching the innards, unless you want an Afro - LOL, zap!.
@@rosswarren436 One method that may or not work well, is to pull the power plug or turn off the switch on your surge protector while the unit is operating. On some equipment this will drain the power caps pretty well, on other pieces, not so much. YMMV. Don't ask me how I know this.
I already jumped in the class d rabbit hole with the Aiyima A08 pro and decided to get the Fosi BT20A pro to do some comparing. I ordered the 20A pro directly from Fosi's store w/48v/5amp power brick which will allow me to use it on the Aiyima too. For $93 delivered I couldn't turn down the Fosi deal.
@@martinm.1528 The difference on both amps is the 48v/5amp brick brings out more bass definition for sure. Sound level is increased and the amps run hotter but I'm going to pull the cases off both and drill holes on the bottom and top to address that. Do I think the power brick upgrade is worth it? Well for what I paid yes but for $50 no.
Got my BT20A Pro today and I absolutely love it. 92€ with shipping and taxes included is an absolute steal for this tiny monster. The tone controls are nice to have and I personally like the way it looks. I did get one with a grey volume knob though. You can't really go wrong for the price.
I just got the fosi bt20a pro. I already owned the TB10D and the BT30pro. This time i opted for the higher voltage 42 volt power supply for the bt20a pro. overall, im a bit disappointed. first, the bt20a pro has a volume knob that looks cool in orange, until you touch it. You can hold it in for 5 seconds to disconnect blue tooth which is great, but the knob is loose and jiggles around when you adjust the volume. if feels so cheap compared to the other fosi stuff. I have not seen this mentioned in any of the reviews i watched. I was expecting to hear LOUDER sound with the 42 volt power supply, and I dont. so overall a bit of a dissapointment for me. I ordered direct from fosi, it came from china and took about 2 weeks. if you dont need blue tooth, the TB10D is the hands down winner for the lower price in my opinion in this match up. I thought the fost 20apro would be a real noticeable difference, it isnt, except for a volume knob that is an embarrassment. the sound is clean and strong, just not any better than the 10D. Let me add something else in here. I bought 4 amps in the past month. 3 Fosi's and one Sony STR DH190. for simply playing music, I would choose the Sony above the Fosi's. it doest have the mini size cool factor, but it has a lot more to offer. It gives you 4 inputs, a remote control, a sleep timer, two speaker outs, a headphone jack, and a 3.5mm input on the front of the unit. it is one slick unit and i own a bunch of way more expensive yamaha recievers, and it SOUNDS GREAT. cost me over 400 bucks to tell you all that so there you go.
Meanwhile, the TB10D sounds perfectly fine and is 3/5ths the price of the BT20A. My second one arrives today. I'll be using it on my desk along with a FiiO K5 Pro ESS and a pair of Neumi BS5s. Two thirds of this setup is based on your recommendations.
Thanks Randy, been waiting for this one. Ordered the FOSI in blue directly from them with their 48V 5A PSU for under $100. Going to roll it with the OPA1612 and see how it compares to the Emotiva a2m and see if I want to return the emotiva.
@@kendallsmith2223 AIYIMA have the upgraded on DC48V 5A ,so the DC48V 5A power adapter are out of stock now, The new DC48V 5A power adapter will arrivel soon, and with safety certification,Safe to use
In addition to the power supply upgrade, the other easy upgrade would be to swap out the op-amp(s) in these units. But they are obviously quite different circuits, and we would have to learn what op-amps do what in these. Some may be single op-amps - and then used in pairs? Some may be on the tone control(s) and some may be input and output stages?
I tried a few of those opamps in 12-20 dollar range in my a07 and I think it's just your mind telling you it sounds better but maybe the ones from muses or spark might make a very slight difference but now your into the 50-80 dollar range. Opamps are more of just a placebo effect.
@@991carreras3 I am sure that a number of op-amps sound similar to each other - but not all of them. I am not an expert on op-amps, as I have only tried about 7 or 8 - but the OPA627 dual mono modules that i got for less than $8 each (shipping included), sound significantly better than the other lower cost ones. And the Muses02 and the Sparkos SS3602 and SS2590 - are massively improved over the rest. It is not even close. Everything is significantly better with these more expensive op-amps. Tonal balance, clarity bottom to top, dynamics, soundstage width and depth, and layering - all are so much better.
@@991carreras3 thinking the Muse02 as offered by Fosi Audio on their website might be the "one" to upgrade to, if anyone was so inclined for the $$, but like you said, the difference seems slight, maybe a bit more microdynamics or such, but that's about it. Seems the TI 3255 is doing all the heavy lifting here. Fosi had a demo video where they changed out the op-amps among three. But unfortunately, it was only presented through RUclips's lossy compression so any differences are very hard to hear, even through neutral headphones. Wish they'd offer samples you could download and hear uncompressed.
@@spamcan9208 Like any amp device, they have different circuit designs, that affect the sound. Bias setup, feedback circuits, types of devices uses, etc all affect the sound quality. The output chips on these amps matter to the sound, as do the output devices and power supply quality.
I currently have a bottom scraping, tiny little Facmogu S800, and it actually works surprisingly well. If these actually sound better (eyeballing the Fosi V3 and Aiyima A07 Max at this point), I will be a happy camper. I have a couple full size receivers by Sony and Yamaha, but those things are too big on my desk and throw off WAY too much heat in my small, hot, attic room and really don't sound any/much better.
I have a douk audio with 4 opp amps I gather you have a op amp per tone control knob, one for main (pre amp), and with the Aiyima one extra prob for bluetooth and pre amp chip that binds all the other op amps, Idea prob is you can mix and match Op amps eg one that provides lower bass response, one fast switching for higher frequencies, one ballanced for mids, one that that is good for bluetooth and one for the final signal before the amp (Some amps if tone control is off goes into Pure Direct mode this is where you want a op amp like OPA1662) . Its a Op Amp soup to your own taste :P
Used to look down on tone control and EQ as was influenced by audiophiles biase. Lately, EQ helps me to enjoy my system again as without EQ, the bass is too heavy for my liking.
Yeah. I learned something today, again. (Although it's almost offtopic, but amp and Schiit.) Now that Schiit put Rekkr onto the table I began to think why on earth could a 4 Ohms: 3W RMS per channel speaker amp be enough for anything (except of very - very little, headphone like speakers), while Magni has 16 ohms: 2.8W RMS per channel and I don't see a direct prohibition on 8 or 4 ohms load impedance. (Maybe I just didn't find it ? :) I put my 40W per channel, 20-30 years old speaker amp away a bit, and I tried Magni as a speaker amp, connecting my 4 ohms (45 - 60W) speakers to the headphone output. It sounds like a dream. Much better than my old speaker amps, and (which is the real surprise!) it's loud enough. There's a multiple of the volume I can allow to myself in my living environment. That little headphone amp can serve my power amp needs, totally. There's no need 40 - 100W power amps in an ordinary living environment. I don't even understand it ... How much power can a Magni serve at 4 ohms ? Anyways, my old, big speaker amps will be "retired" for a while ...
I tested my xduoo mt-602, xduoo mt-601 and topping L30 amps too, and none of them does this "speaker amp" functionality as well as the Magni. They make some sound, but it's low volume and/or distorted pretty much. (On paper they don't even go as low as 4 ohms load impedance.) But Magni functions as a power amp very well, even though I didn't find official specification what includes 4 ohms, either. I would be curious about the official justification why Magni can do it this good. And if Magni can do that this good, then why can the others not do it ?
Strange error or symptom that when I preamp with Heretic (preamp my 2021 or 2023 Magni+ using as power amp) on the higher gain, somewhere above 75% volume the Heretic cuts off (with a quiet click), and it comes back only if I lower the volume. My Magnis do not do that only the Heretic. Which makes the Heretic a better power (speaker) amp than a preamp. Which is funny ... :)
The Ayima A07 Pro and Fosi Audio BT20A Pro are good for a Desktop, Starter or secondary system and has enough power to play anything, but in my opinion they don't compete with the Sony STR-DH190, with its power and features. You got 100 watt per channel at 8 ohms, 3 RCA inputs, and A and B zones, built-n phono pre-amp, Bluetooth, and a really good remote. The amp is also very neutral, so you can pair it with any speakers. Unfortunately, it doesn't cost $100 anymore, but it retails for $199, but they go on sale all the time for $149, which is atill a good buy at that price. It's a great time to be in this hobby since you don't have to spend over a grand to get good sounds and we have so many options nowadays.
@@herminio001 I have both the STR-DH190 and the A07. The Sony is in my living room running my floorstanders and the A07 is powering bookshelf speakers for my PC. They both sound good to me, but maybe I'll try comparing them head-on.
I've got the A07 and D03 - I was, and continue to be impressed by the A07. I picked up the D03 in hopes of getting the A07 sound in and integrated amp. Unfortunately, I found it to be shallow and lacked the charm of the A07 through the RCA inputs (USB and the DAC is great) . How do you think either the Fosi Audio or A07 Pro compare to the D03?
Purchased the Fosi Audio with the upgraded power supply. It pushes my Klipsch bookshelf speakers to the max. My only concern is how hot the amp gets. Thanks Randy for your insight.
You get an OpAmp! And you get an OpAmp! I bought an Ayima D05 amp and Elac 4 inch speakers and she really enjoys the sound. Low cost high fidelity sound is real. Thanks Randy!
Aiyima has a new A07 max that just came out. It's basically a fosi v3 but you can run it stereo or mono 😮 I think I might order 2 of them. They are on sale as of now
Any plans to review the Arylic B50 ($140)? I got one for our guest bedroom because it has HDMI ARC and a phono input. So far I'm pretty happy with it. It's not the BEST sounding amp I've EVER heard, but it's not bad at all IMO.
Sparkos Labs! I swapped mine out, and you really do get the sound you would hear from amps costing $1,000 or more. My other amps are Bryston, Firstwatt, and Arcam...and the sound I got after my switcheroo...left me laughing in amazement. You've gotta try this upgrade. $160 for an INSANE performance boost.
about swapping opamp, i notice that both these pro versions still come with NE5532 so if sound could be improved significantly with an extra $10 opamp over NE5532 they would have both chosen it for their pro versions, no ?
Hey, I got myself a pair of polk audio r100 and an aiyima a07 pro. my problem with those speaker is the lack of bass and i would like to add a subwoofer to the setup. how would i manage the crossover? i dont see a way to do that via the aiyima? should i connect my speaker to an active subwoofer and let the subwoofer handle it? return the r100 and get r200 instead of of a sub?
I bought few a07 pros and in every amp i was hearing loud hiss even when the volume pot was all the way down. Never had thit issue with original a07, a07 max, a08 pro, fosi v3, bt20a pro and many other amps
FOSI BL20A was My 1st Buy for The Rated 0.001% THD Rating at 100 watts per Channel for My Wharfedale Linton W2 Vintage Set Up in TEAK 👌 THANK YOU RANDY 🤘
Great comparison Randy. I just got my feet wet with separates and I bought the Fosi Audio BT20A Pro and paired with Dali Spektor 2. I love how it sounds. I am listening music via bluetooth using Amazon music at the moment til I get a DAC.
Randy, the A07 Pro seems a bit more flexible with op amp possibilities, and also note that the power brick offered on Amazon actually states 36V, 6A, delivering almost 100W RMS per channel dependent on the speaker loading. I’m thinkingnof giving the A07 a go to see how it plays with my cheap Elac BS41’s . Might be a good match😉
The A07 Pro's tone controls do not have the central detent, which means we can hardly find the zero gain point. The BT20A Pro has that to defeat tones.
@@IsaacD507 Maybe you didn’t find it, there is a 0 position above the treble and bass pitch, and the adjustment corresponds to this position, which is the central detent zero gain point
Bought the Fosi on your recommendation and it meets my need fantastically. Got the bigger 48V adapter which gave out after 3 months, bought of the Fosi aliexpress site and was a wee bit worries, however service was excellent send a relacement without the need to return the failed power supply. All is working well again. Any recommendations for a cheap 5.1 setup for SACD ( no schit as I am more likely to find a heard of unicorns in the uk).
Got the bt30d pro. Ended up cheaper than the bt20d pro after codes and looks the be pretty much the same. Pretty happy with it for the price and paired it with a ampapa a1 tube pre amp as a way to experiment with tubes
Greetings! At 6:55 you mention that both are a step up from a Sony Amplifier. Were you referring to the Sony STRDH190?? I bought this Sony player and was wondering if I should cancel my order
The original Aiyima A07 (non pro) is great and replaced 2 Pass lab ACA amps in monoblock for my desktop. Could barely tell the difference. This company has since been on my radar for other potential low cost upgrades.
I've had a similar experience. Recently set up a new 2.0 system and decided to try an A07 instead of something like a Cambridge CX60/61 integrated. Based on the performance here, I don't think I'd go back to something that pricey. If you need a remote, get a small variable volume DAC that includes one.
I don’t see where OP said ‘beat’. It may be that the excellence of the Pass Labs was masked by other desktop components, so the difference would be negligible.
I've got some old 4 ohm cerwin vega re30 loudspeakers with 97 db sensitivity that need the dust knocked off of em. I gotta try one of these little amps
I purchased the BT20a Pro I hooked it up to my radio and the RCA input I tried to link to my Bose Revolve speaker blue tooth and cannot get it to Link? any help would be appreciated. Thank you
@@cheapaudioman Also, fixed audio out on the A07 Pro and variable with with Fosi BT20A Pro? The tides have shifted to the Fosi BT20A Pro. What good is a sub out if you have to constantly adjust the volume of the subwoofer? So glad I bought the Fosi BT20A Pro. Also, I bought the Fosi TB10D and an Aiyima A07. I know, I may have went a little hard and bought 3 at the same time. I've got the Fosi TB10D on my office set up with a BT/DAC combo unit the Bludento HD1 with a pair of Sony SSCS-5 and Randy, it sounds mother flippin good to me. The Sony's actually have bass in my little office. No sub needed. I did also buy a Monoprice 8" sub when they were on sale a month ago for $27 and I may have purchased two of them. Haha. I am going to try the A07 with the line out to one of the subs to see how that sounds, but it's a bit of a buzz kill knowing the output is not variable. Thank you for responding with the answer, Randy!
Maybe the Aiyima has single channel opamps? You would always have to get two opamps. The Fosi has 4 opamps as wel but two are soldered. Btw. The AUX output is not a pre-out. It is line level.
How does this compare to an older receiver and a $10 Bluetooth receiver of powering some outdoor speakers. I see these are around 40 watts per channel and $80. There are so many cheap 100 watt non HDMI and older HDMI version receivers for under $40. Size is a huge factor. But if it isn't, would the older class AB tech yield better sound quality? These tiny amps are great, but you still have to deal with the power brick, speaker wires, and power cord. Trade off here?
I tried the following BT30d pro, A07, A07 pro, smsl da8, smsl a300 all of them went back to amazon. The a07 the wife kept. I find these D amps sound annoying after a few hours of listening. My Pioneer Elite AV VSX receiver from 1999 still sounds good after hours of listening. But my search for a small amp goes on and this week my schiit gjallarhorn arrives. Hopefully it's a keeper. The cheap Chinese stuff I'm done with.
Hi, love your rreviws. I went for a Fosi BT20a Pro after having an Aiyima T9Pro. I prefer the sound and the push of the extra watts. However, my Fosi now has almost zero volume when using a bluetooth connexion but works fine with and RCA lead connexion. Any ideas why, please?
The 5532 is a 50 years old amp that was good when it came out. Now it should be illegal to use for Hifi, it can ruin every good signal you send into it. It measures bad and it sounds very bad. And why does people still use it then ?? - because it is dirt cheap, and some people still think it is good. Tubes and some other old components still sound good, but it is NOT true for old op-amps. I have bought a few Breeze Audio TPA 3116 based amps, and they sound very good ... if you change the 5532 to an LM4562 or similar op-amp, or better yet a discrete op-amp.
Hi I biought a fosi v3 they claim 300w per chanel, thsi amp barely puts out 20 watts, the sound quality is great, i have tried this with 4 ohms, 6, and 8 ohm speakers, I am quite dissapointed with the power, are these amps supposed to be used with a preamp?
So, I bought the Fosi Bt20 Pro, and the conclusion is that it's just terrible. Ok, I went from an Luxman class A amp with Bluesound Dac. But the Fosi with Bluesound just sounds bright/distorted, no "soft convincing sound. Like walking on a nailmat. The positive thing is that you don't need to be afraid the kids destroy it.😅
Piggybacking on Cloudy's comment, I too have a BT20A coming soon, and am hoping I did right by thinking that the "pre-out" 3.5 jack can be tapped as if it were a Tape Out. Right? Wrong? Thanks!
Love the channel mate. What would you recommend as a decent speaker pairing on a PC with the Aiyima A07 pro speaker wise? Debating with myself whether to get a pair of Qacoustics 3010i or not. 🤔
The Fosi swappable op amps are dual op amps, and there are two others soldered to the board. Not sure about the configuration of the op amps on the Aiyima. Fosi have confirmed that , despite the fact that they are dual op amps, both must be replaced at the same time (both the socketed ones, I mean). Much as I like the Fosi, not entirely sure these are the best Class D amps. I suspect a Purifi Eigentakt might knock them for six, but then they are also 10 times the price at least.
Would there be a good difference going from Loxjie a30 to one of these? Rocking 3050i looking for cleaner sound, less distortion, better punch and control in bass.
Hey Randy, just for giggles, how about doing a retrospective review of the budget class D setup that started it all for many? - the lepy / lepai lp-2020a paired to Dayton B652
I purchased the Fosio BT 20A pro and was disappointed for sure. Way over hyped up product. Doesn't deliver. Sounded very tinnie. No we're to add a sub. Don't waste your time.😢
since both have the same amp chip, i'm pretty sure the diff between them is purely made by the op amps. the one with better op amps, will clearly sound way more better than the other one. also, capacitors have a significant role on the sound, the bigger (in Farads) the more "rounded" output sound. i have bt20a pro and i intend to switch the op amps to MUSES02 (~90$ for both) or Sparkos SS3602 (150$ for both) and maybe use a linear power supply. the problem is this amp can become way more expensive, from 100$ to almost 300$. at 300$ I can buy a Yamaha AS201 which will sound better than any class D amp on the market (I simply cannot compare class AB with a class D, AB will always be superior) from a tinker point of view, it will worth the mod price but from a budget + sound point of view it's clearly not worth the effort.
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Hi, Randy - great review. Could you be more specific on which Sony amp/receiver you’re comparing these to? Just curious to take a deeper dive on the specs. Cheers 🍻
How does it compare to the Upgraded Version Fosi Audio TB10D ?
Hi Randy,as i know the fosi BT20A Pro amp before it's even listed it shows 472 ratings which they replaced an old product with this one,but AIYIMA A07 and Pro are the product real review so I really like the AIYIMA products,Because this is a authentic product evaluation
Can You make a review of Aiyima T5 tube amplifier with build in phono preamp?
According to my audiophile friend, A07 Pro does sound with a little more mid-range clarity & emphasis. If you'd like the sound signature with a little more bass & treble presence, A08 Pro may be a better fit to your liking.
As for 5 swappable OP amp chips, roughly speaking:
1. the front right one is for input buffering and amplification,
2. the front left one is for bass & treble tone controls,
3. the middle left one is for single-ended to differential conversion of the left channel,
4. the middle right one is for single-ended to differential conversion of the right channel, (We'd better use the same model of OP amps for left and right channels at the same time I guess.)
5. and the rear one is for aux output buffering.
Further fine-tuning its sound signature to your liking may be possible since you get FIVE swappable OP amps instead of TWO. Now it's your turn to play around with the OP amp rolling stuff if you'd like, have fun & happy rolling ;)
Where does someone go to get OpAmps to swap and how does one choose? I'd assume the buffering ones aren't compatible with the conversion ones?
@@ynstyne You can buy OP amps from Digikey or Mouser, for example.
There're lots of discussions on sound signature difference of various OP amps. Pull the trigger based on your own research & preference to give it a try. Many people prefer Muses 02, to name one.
There are five NE5532 OP amps socketed inside when you buy a brand new Aiyima A07 Pro as far as I know. Those five are the same, and most OP amps are compatible regarding what you concerned.
Excellent post Steve...
so the ones those affect the sound most are no.3&4 (mid left&right) ? or should I also change no.1 as well?
So would you say that the A07 pro and A08 pro sound different? Considering they pretty much she was the same chip
Thanks to you Randy, i bought Aiyima A07 Pro with Aiyima T6 pro preamplifier. Hooked up with Kanto Yu Passive 5.25 or Kanto YUP 6 , and i connected my subwoofer Eris Sub 8 with high low converter , so not using the 3.5 mm jack for sub. The sound is extremely good , detailed and it gets loud loud ! I am very happy with the sistem i got . Maybe later on, will change some opamps, but for now is everything one could desire. I had previously, Logitesc , Edifier 2.1 sistems. This combination of mine is smoking everything i had before for pc sistem . Dont get me wrong , i have in my main room 7.1 with tower Canton speakers, so i can make a comparison. Really good sounding this Aiyima ! Thanks Randy and continue the good work, because of you i found out i can have a very spectacular audio sistem and not go bankrupt 😂
A Difference between the Aiyima and Fosi that can be very important to some: The Aiyima has a Bluetooth/Aux Switch on the front. The Fosi has no physical switch, it defaults to Bluetooth when anyone connects and the Bluetooth is searching for a signal at all times when its on. If you live in a dorm, apartment, condo, ANYONE can Hijack your audio, and depending on your settings, it can happen at a much louder volume. I do not like anyone in the vicinity having this control, there is no way to disable the Bluetooth. I see that you can un-pair a hi-jack by pressing and holding the volume knob...but that only works after the hi-jack has happened. There is a new Fosi V3 coming out with no Bluetooth...that is the one for me.
Exactly this! I contacted fosi to address this problem. They do nothing with it.. Ayima's physical switch is awesome. I use the a03 a lot, because it powers passive subs. The fosi bt10&20 I use for portable builds
I've been building speakers over 20 years and used many of the original A07 since it came out in 2020. I have a pair of 6 Inch 2 way speakers in my shop that use an 8 ohm SB acoustics woofer and are a nominal 6 ohm load. Switching to a 48 volt power supply on the A07 with these speakers is night and day, not a subtle effect at all.
You'll still notice it with 4 ohm speakers, but if you really want to hear a difference in the bass and are running 6 to 8 ohm speakers, I highly suggest you try a 48 volt power supply to really hear the magic these amps can produce. I have never experienced any problems with the amp getting hot either.
If i want to use a 48v Power supply, can i Just buy a cheap one or so i have to pay Attention to anything (how many amp?)
@@tobiasschnitzer1449 Hi Tobias, I thought I replied to your question a few days ago but apparently it didn't stick. I prefer fanless meanwell ps with power factor correction, but you can just try out a cheap brick to observe the differences for yourself. Loud is not my thing, this is about an amplifier's ability to instantaneously deliver power through a given resistance.
The reason car audio uses 4ohm drivers (and in the age of digital amps 2 or even 1ohm) is because a 12volt system is limited in the amount of power it can deliver through an 8ohm load.
Without getting into damping factor and a bunch of electrical engineering lingo, let's just say that the voltage is the electrical equivalent of pressure, and the higher it is, the more easily it can drive through a higher resistance load. This is especially noticeable in bass transients and gives life to the music no matter what level you are listening at. Particularly if you are using speakers with highish resistance and low sensitivity.
Volts x amps = watts, and a voltage controlled system runs cooler than a current controlled system. If you up the volts you can go with less amperage and maintain the same wattage. The 3255 chip specs show a max voltage of 53.5 and stereo wattage of 315, but the amp design for the A07 indicates 48v and at least 7.5amps, giving 360 watts. However, I think 5 or 6 amps is more than you'll ever need unless you're one of "those" listeners, which I am not unless inebriated lol Enjoy the experiments!
I dig my Aiyima A07 Pro pretty good for 2 channel. You can connect the A07 Pro to the original A07 TPA3255 with a aux 3.5mm for even more power. Which is pretty cool if wanted. I switch back and forth to my Yamaha RX-A820 Aventage receiver and Emotiva BasX 3 channel amp. Aiyima makes a good product.
The Hi-Fi world really has changed ! Aiyima A07 Pro (36V) connected to a Wiim Mini and Dali Oberon 3 speakers + Mivoc Sub was the perfect choice for me ! A07 Pro sounds much clearer and with more sparkle than all my expensive A & A/B amps from the past (Marantz, Technics, Kenwood, Yamaha) I can only recommend it to everyone who loves perfect music...
I have some expensive amps from sansui, onkyo, technics etc, but I dont think they sound perfect, They are big and heavy, do you think that one of these little modern amps are better than old vintage amps?
I want clear crisp sound, the power does not matter for me, I just want to hear clear audio on my room without annoy my neighbors.
@@ChengGaos I understand. Then do yourself a favour and give the A07 Pro a chance. Trust me you won't regnet it. Grab one and tell me about it afterwards...
I much preferred the sound of my original $55 Ayima A07 to my $1,000 Emotiva XPA-5 Gen 2 if anyone can believe it. The Emo sounded too forward, the Ayima is an absolute steal for the price
Was that with stock op amps in the A07 or did you upgrade them?
Sounding much better. I hope you're over the worst. Thanks for sharing this with us all. Take care and all the best.
I bought an Aiyima T9 for my son's first system last November. Sounds pretty damn good! I have a little system in the garage/workshop being driven by a $45 Pyle class D amp. I bought in 21 and figured why not for the garage. I hadn't started watching this channel yet. So I picked up an Aiyima A07 Pro based off of this video and holy crap! Two amps under $100 and they couldn't be more different. I'm driving some Infinity bookshelf speakers that were surrounds before and I'm amazed. I know the Pyle amp is really, really cheap but I didn't expect another sub $100 amp to make it seem disposable.
how would you described sonic difference between Aiyima T9 and 07 Pro?
@KonradSkowronski hard to say off the top of my head as I haven't tried them on the same speakers yet. The T9 is paired with Kilpsch and the A07 with Infinty. I know the T9 can drive the Klipsch so loud I can hear them outside despite the system being in an insulated basement. I will say the soundstage is pretty remarkable in the A07.
@@tmdillon1969 Thanks for reply. I already have SMSL DA-9 but need another little amp for another room and I am thorn between T9 and A07 (or A07 Pro wich apparently sounds very different). If you have a chance to compare these two on sam speakers please let me know what you think :)
@@KonradSkowronski will do.
@@tmdillon1969 👌🏻
Listening to this video on my shiny new A07 Pro. Couldn't be happier with my 80$ purchase. BTW, mine came with a 36V 6A power supply. Really makes my RP 160m speakers shine compared to my old Sony Stereo receiver. I had no idea such great sound could be had for so little money. Losing the left channel on my old receiver really was a blessing in disguise!
Well, if you want the bottom end rocking rocking and better than the Fosi...the most important are the 2 in the middle swapping to opa2604...2 opa627 in the front and in the back 1 opa445bm, will sound really really good and you can make sound the way you want and even sound like a different amplifier by just moving the tone control everyday
Hi, do you know which op amps are for individual outputs. Which is blue tooth, which is rca? What's the 5th one for? Is it for the 3.5mm jack? Also, have you noticed that if you use Bluetooth, it sounds great, but the rca's are lackluster? At least on mine. Interested in what you think, as I love the 2604s. Right now, I'm running 649sa in an a07. They sound great but can be too detailed and can ruin certain songs as you hear things you can't with anything else. I'm hoping someone can tell me what each op amp is for in the pro so I can set it up right. I'm running my sub on the 3.5mm output and would love to make that a 2604. Any knowledge would be appreciated as I'm knew to this.
@@kittykatking7882 I don't think that there is a specific opamp for bluetooth or rca, 2 in the middle feed the tpa3255, not sure if 2 at front are for tone control and the last maybe for voltage regulator...I have tried 5 opa1656 mehh, lme49860 mehh, muses02 but none of those improved sound in any position, like the one I mentioned in prior comment. Also didn't tried any expensive SS3602 or Spakos labs, I would let someone to try those and compare to my suggestions.
It's it my imagination, or did it turn ON without a power supply connected at 2:14? Magic!
On board capacitors can hold a charge for a while and modern LEDs don't take a lot of energy to light up.
@@joelcarson4602 good reason to be CAREFUL when playing around on the inside of these devices. Better to unplug them and let them sit for a day or two and let the capacitors discharge before touching the innards, unless you want an Afro - LOL, zap!.
@@rosswarren436 One method that may or not work well, is to pull the power plug or turn off the switch on your surge protector while the unit is operating. On some equipment this will drain the power caps pretty well, on other pieces, not so much. YMMV. Don't ask me how I know this.
Geeez........... nice eye. 🔈🔉🔊
@@rosswarren436 I'll keep this in mind. Good Call. 🔈🔉🔊
I bought the A07 Pro because I liked the source/BT switch on the front. I don't like how the Fosi handles this.
The fifth Op-Amp is for the bluetooth connection.
Looking at just the inside, the Aiyima looks like it's a much beefer amplifier. Thanks for bringing us this comparison.
I already jumped in the class d rabbit hole with the Aiyima A08 pro and decided to get the Fosi BT20A pro to do some comparing. I ordered the 20A pro directly from Fosi's store w/48v/5amp power brick which will allow me to use it on the Aiyima too. For $93 delivered I couldn't turn down the Fosi deal.
So now I want to know how they compare!
Please tell us how they compare...
@@martinm.1528 The difference on both amps is the 48v/5amp brick brings out more bass definition for sure. Sound level is increased and the amps run hotter but I'm going to pull the cases off both and drill holes on the bottom and top to address that. Do I think the power brick upgrade is worth it? Well for what I paid yes but for $50 no.
@@fritzkabeano1969just add a fan
Considered that but they never get hot enough to justify it@@chrisy4011
Got my BT20A Pro today and I absolutely love it. 92€ with shipping and taxes included is an absolute steal for this tiny monster. The tone controls are nice to have and I personally like the way it looks. I did get one with a grey volume knob though. You can't really go wrong for the price.
I just got the fosi bt20a pro. I already owned the TB10D and the BT30pro. This time i opted for the higher voltage 42 volt power supply for the bt20a pro. overall, im a bit disappointed. first, the bt20a pro has a volume knob that looks cool in orange, until you touch it. You can hold it in for 5 seconds to disconnect blue tooth which is great, but the knob is loose and jiggles around when you adjust the volume. if feels so cheap compared to the other fosi stuff. I have not seen this mentioned in any of the reviews i watched. I was expecting to hear LOUDER sound with the 42 volt power supply, and I dont. so overall a bit of a dissapointment for me. I ordered direct from fosi, it came from china and took about 2 weeks. if you dont need blue tooth, the TB10D is the hands down winner for the lower price in my opinion in this match up. I thought the fost 20apro would be a real noticeable difference, it isnt, except for a volume knob that is an embarrassment. the sound is clean and strong, just not any better than the 10D. Let me add something else in here. I bought 4 amps in the past month. 3 Fosi's and one Sony STR DH190. for simply playing music, I would choose the Sony above the Fosi's. it doest have the mini size cool factor, but it has a lot more to offer. It gives you 4 inputs, a remote control, a sleep timer, two speaker outs, a headphone jack, and a 3.5mm input on the front of the unit. it is one slick unit and i own a bunch of way more expensive yamaha recievers, and it SOUNDS GREAT. cost me over 400 bucks to tell you all that so there you go.
My Fosi is in the mail. Thanks for the info Randy.
Meanwhile, the TB10D sounds perfectly fine and is 3/5ths the price of the BT20A. My second one arrives today. I'll be using it on my desk along with a FiiO K5 Pro ESS and a pair of Neumi BS5s. Two thirds of this setup is based on your recommendations.
Thanks Randy, been waiting for this one. Ordered the FOSI in blue directly from them with their 48V 5A PSU for under $100. Going to roll it with the OPA1612 and see how it compares to the Emotiva a2m and see if I want to return the emotiva.
Tell us when you get the 48v 5A power psu from fosi because Randy said one from aiyima have Audible sound something but thank you homie
@@kendallsmith2223 AIYIMA have the upgraded on DC48V 5A ,so the DC48V 5A power adapter are out of stock now, The new DC48V 5A power adapter will arrivel soon, and with safety certification,Safe to use
@@kendallsmith2223 The FOSI 48V 5A sounds clean to me, no issues. Might try it on my Aiyima A07
So, did you hear any distortions?
@@aeternalux9175 no sounds fine
Again, great video. Thanks! Good comparison! Good Hifi affordable options.
In addition to the power supply upgrade, the other easy upgrade would be to swap out the op-amp(s) in these units. But they are obviously quite different circuits, and we would have to learn what op-amps do what in these. Some may be single op-amps - and then used in pairs? Some may be on the tone control(s) and some may be input and output stages?
I tried a few of those opamps in 12-20 dollar range in my a07 and I think it's just your mind telling you it sounds better but maybe the ones from muses or spark might make a very slight difference but now your into the 50-80 dollar range. Opamps are more of just a placebo effect.
@@991carreras3 I am sure that a number of op-amps sound similar to each other - but not all of them. I am not an expert on op-amps, as I have only tried about 7 or 8 - but the OPA627 dual mono modules that i got for less than $8 each (shipping included), sound significantly better than the other lower cost ones. And the Muses02 and the Sparkos SS3602 and SS2590 - are massively improved over the rest. It is not even close.
Everything is significantly better with these more expensive op-amps. Tonal balance, clarity bottom to top, dynamics, soundstage width and depth, and layering - all are so much better.
@@991carreras3 thinking the Muse02 as offered by Fosi Audio on their website might be the "one" to upgrade to, if anyone was so inclined for the $$, but like you said, the difference seems slight, maybe a bit more microdynamics or such, but that's about it. Seems the TI 3255 is doing all the heavy lifting here. Fosi had a demo video where they changed out the op-amps among three. But unfortunately, it was only presented through RUclips's lossy compression so any differences are very hard to hear, even through neutral headphones. Wish they'd offer samples you could download and hear uncompressed.
How do op amps change the sound anyway?
@@spamcan9208 Like any amp device, they have different circuit designs, that affect the sound. Bias setup, feedback circuits, types of devices uses, etc all affect the sound quality. The output chips on these amps matter to the sound, as do the output devices and power supply quality.
I currently have a bottom scraping, tiny little Facmogu S800, and it actually works surprisingly well. If these actually sound better (eyeballing the Fosi V3 and Aiyima A07 Max at this point), I will be a happy camper. I have a couple full size receivers by Sony and Yamaha, but those things are too big on my desk and throw off WAY too much heat in my small, hot, attic room and really don't sound any/much better.
How about the BT20A vs the TB10D 😊
I have a douk audio with 4 opp amps I gather you have a op amp per tone control knob, one for main (pre amp), and with the Aiyima one extra prob for bluetooth and pre amp chip that binds all the other op amps, Idea prob is you can mix and match Op amps eg one that provides lower bass response, one fast switching for higher frequencies, one ballanced for mids, one that that is good for bluetooth and one for the final signal before the amp (Some amps if tone control is off goes into Pure Direct mode this is where you want a op amp like OPA1662) . Its a Op Amp soup to your own taste :P
Used to look down on tone control and EQ as was influenced by audiophiles biase. Lately, EQ helps me to enjoy my system again as without EQ, the bass is too heavy for my liking.
Yeah.
I learned something today, again.
(Although it's almost offtopic,
but amp and Schiit.)
Now that Schiit put Rekkr onto the table
I began to think why on earth could a 4 Ohms: 3W RMS per channel
speaker amp be enough for anything (except of very - very little, headphone like speakers),
while Magni has 16 ohms: 2.8W RMS per channel and I don't see a direct prohibition on 8 or 4 ohms load impedance.
(Maybe I just didn't find it ? :)
I put my 40W per channel, 20-30 years old speaker amp away a bit,
and I tried Magni as a speaker amp, connecting my 4 ohms (45 - 60W) speakers to the headphone output.
It sounds like a dream.
Much better than my old speaker amps,
and (which is the real surprise!) it's loud enough.
There's a multiple of the volume I can allow to myself
in my living environment.
That little headphone amp can serve my power amp needs,
totally.
There's no need 40 - 100W power amps in an ordinary living environment.
I don't even understand it ...
How much power can a Magni serve at 4 ohms ?
Anyways,
my old, big speaker amps will be "retired" for a while ...
I tested my xduoo mt-602, xduoo mt-601 and topping L30 amps too,
and none of them does this "speaker amp" functionality as well as the Magni.
They make some sound, but it's low volume and/or distorted pretty much.
(On paper they don't even go as low as 4 ohms load impedance.)
But Magni functions as a power amp very well,
even though I didn't find official specification what includes 4 ohms, either.
I would be curious about the official justification why Magni can do it this good.
And if Magni can do that this good, then why can the others not do it ?
Strange error or symptom
that when I preamp with Heretic (preamp my 2021 or 2023 Magni+ using as power amp)
on the higher gain, somewhere above 75% volume the Heretic cuts off (with a quiet click),
and it comes back only if I lower the volume.
My Magnis do not do that only the Heretic.
Which makes the Heretic a better power (speaker) amp than a preamp.
Which is funny ... :)
The Ayima A07 Pro and Fosi Audio BT20A Pro are good for a Desktop, Starter or secondary system and has enough power to play anything, but in my opinion they don't compete with the Sony STR-DH190, with its power and features. You got 100 watt per channel at 8 ohms, 3 RCA inputs, and A and B zones, built-n phono pre-amp, Bluetooth, and a really good remote. The amp is also very neutral, so you can pair it with any speakers. Unfortunately, it doesn't cost $100 anymore, but it retails for $199, but they go on sale all the time for $149, which is atill a good buy at that price. It's a great time to be in this hobby since you don't have to spend over a grand to get good sounds and we have so many options nowadays.
STR-DH190 is no competition in terms of sound. Sorry...
@Angelheart 76 your opinion not mine, I do have the Aiyima A07, i simply prefer A/B class amps.
@@herminio001 I have both the STR-DH190 and the A07. The Sony is in my living room running my floorstanders and the A07 is powering bookshelf speakers for my PC. They both sound good to me, but maybe I'll try comparing them head-on.
I've got the A07 and D03 - I was, and continue to be impressed by the A07. I picked up the D03 in hopes of getting the A07 sound in and integrated amp. Unfortunately, I found it to be shallow and lacked the charm of the A07 through the RCA inputs (USB and the DAC is great) . How do you think either the Fosi Audio or A07 Pro compare to the D03?
Purchased the Fosi Audio with the upgraded power supply. It pushes my Klipsch bookshelf speakers to the max. My only concern is how hot the amp gets. Thanks Randy for your insight.
Not audiophile but great for the garage, Chicom's come through with a deal.
You get an OpAmp! And you get an OpAmp! I bought an Ayima D05 amp and Elac 4 inch speakers and she really enjoys the sound. Low cost high fidelity sound is real. Thanks Randy!
Aiyima has a new A07 max that just came out. It's basically a fosi v3 but you can run it stereo or mono 😮 I think I might order 2 of them. They are on sale as of now
I've got the A07 with Sparkos upgrades...it rips but made my cs5's too bright. So now looking for a warmer sounding speaker.😢
_______I have a very hot radiator on this amplifier. How about yours?________I used a standard 36V5A power supply. And also 42V5.7A MeanWell_________
Any plans to review the Arylic B50 ($140)? I got one for our guest bedroom because it has HDMI ARC and a phono input. So far I'm pretty happy with it. It's not the BEST sounding amp I've EVER heard, but it's not bad at all IMO.
Randy are you going to recomend opamps upgrades for either or both?
Sparkos Labs! I swapped mine out, and you really do get the sound you would hear from amps costing $1,000 or more. My other amps are Bryston, Firstwatt, and Arcam...and the sound I got after my switcheroo...left me laughing in amazement. You've gotta try this upgrade. $160 for an INSANE performance boost.
Arm twisted... I have to try one now. is the line out's output level controlled by the volume control (Which the regular A07 does not do)?
I would also like to know.
Glad to see and hear you doing better!
about swapping opamp, i notice that both these pro versions still come with NE5532 so if sound could be improved significantly with an extra $10 opamp over NE5532 they would have both chosen it for their pro versions, no ?
Hey, I got myself a pair of polk audio r100 and an aiyima a07 pro. my problem with those speaker is the lack of bass and i would like to add a subwoofer to the setup. how would i manage the crossover? i dont see a way to do that via the aiyima? should i connect my speaker to an active subwoofer and let the subwoofer handle it? return the r100 and get r200 instead of of a sub?
In the Aiyima the 2 opamps in the middle are the most important.
which one would you take Aiyima A07 Pro or Aiyima A08 Pro ?
Man, I just bought a A07 last month, didn't realize there's a Pro version.
I bought few a07 pros and in every amp i was hearing loud hiss even when the volume pot was all the way down. Never had thit issue with original a07, a07 max, a08 pro, fosi v3, bt20a pro and many other amps
WOW randy you look like you're feeling much better.
I am.
FOSI BL20A was My 1st Buy for The Rated 0.001% THD Rating at 100 watts per Channel for My Wharfedale Linton W2 Vintage Set Up in TEAK 👌 THANK YOU RANDY 🤘
Great comparison Randy. I just got my feet wet with separates and I bought the Fosi Audio BT20A Pro and paired with Dali Spektor 2. I love how it sounds. I am listening music via bluetooth using Amazon music at the moment til I get a DAC.
Randy, the A07 Pro seems a bit more flexible with op amp possibilities,
and also note that the power brick offered on Amazon actually states 36V, 6A, delivering almost 100W RMS per channel dependent on the speaker loading. I’m thinkingnof giving the A07 a go to see how it plays with my cheap Elac BS41’s . Might be a good match😉
Yes, you can test it , Amazon shopping is easy,you will have a nice surprise,If you don't need the gain, you can adjust the A07 Pro to 0 position
The A07 Pro's tone controls do not have the central detent, which means we can hardly find the zero gain point. The BT20A Pro has that to defeat tones.
@@IsaacD507 Maybe you didn’t find it, there is a 0 position above the treble and bass pitch, and the adjustment corresponds to this position, which is the central detent zero gain point
Bought the Fosi on your recommendation and it meets my need fantastically. Got the bigger 48V adapter which gave out after 3 months, bought of the Fosi aliexpress site and was a wee bit worries, however service was excellent send a relacement without the need to return the failed power supply. All is working well again. Any recommendations for a cheap 5.1 setup for SACD ( no schit as I am more likely to find a heard of unicorns in the uk).
Got the bt30d pro. Ended up cheaper than the bt20d pro after codes and looks the be pretty much the same. Pretty happy with it for the price and paired it with a ampapa a1 tube pre amp as a way to experiment with tubes
Gonna get the Fozzy for me shop! Can’t wait to get the giant surround Rx out of there
Greetings! At 6:55 you mention that both are a step up from a Sony Amplifier. Were you referring to the Sony STRDH190?? I bought this Sony player and was wondering if I should cancel my order
The original Aiyima A07 (non pro) is great and replaced 2 Pass lab ACA amps in monoblock for my desktop. Could barely tell the difference. This company has since been on my radar for other potential low cost upgrades.
Really? It beats the pass lab? I don't think so
@@MasterofPlay7 I am sure it is even not better /comparable and cannot compete my ADCOM GFA 555 MK2 , so sure Pass labs is superiors by far
I've had a similar experience. Recently set up a new 2.0 system and decided to try an A07 instead of something like a Cambridge CX60/61 integrated. Based on the performance here, I don't think I'd go back to something that pricey. If you need a remote, get a small variable volume DAC that includes one.
I don’t see where OP said ‘beat’. It may be that the excellence of the Pass Labs was masked by other desktop components, so the difference would be negligible.
@@MasterofPlay7 I said ACA amps, which are the cheaper DIY amp kits designed by Nelson Pass.
Thanks Randy, can you do an episode on switching op amps?
Believe he did one
Hope you are feeling better I really look forward to your videos.
you absolutely must try the Superlux HD-668B headphones, fantastic!!!!
a07 pro comes with 36 volt and 6 ampere not 5.
I've got some old 4 ohm cerwin vega re30 loudspeakers with 97 db sensitivity that need the dust knocked off of em. I gotta try one of these little amps
I purchased the BT20a Pro
I hooked it up to my radio and the RCA input
I tried to link to my Bose Revolve speaker blue tooth and cannot get it to Link?
any help would be appreciated.
Thank you
Man, the input selector switch on the A07 pro the deal sealer. How the heck to you switch inputs on the Fosi? Great video!!!!
Hold the volume button down for a while and it switches. Toggle is a lot easier though
@@cheapaudioman Also, fixed audio out on the A07 Pro and variable with with Fosi BT20A Pro? The tides have shifted to the Fosi BT20A Pro. What good is a sub out if you have to constantly adjust the volume of the subwoofer? So glad I bought the Fosi BT20A Pro. Also, I bought the Fosi TB10D and an Aiyima A07. I know, I may have went a little hard and bought 3 at the same time. I've got the Fosi TB10D on my office set up with a BT/DAC combo unit the Bludento HD1 with a pair of Sony SSCS-5 and Randy, it sounds mother flippin good to me. The Sony's actually have bass in my little office. No sub needed. I did also buy a Monoprice 8" sub when they were on sale a month ago for $27 and I may have purchased two of them. Haha. I am going to try the A07 with the line out to one of the subs to see how that sounds, but it's a bit of a buzz kill knowing the output is not variable. Thank you for responding with the answer, Randy!
Maybe the Aiyima has single channel opamps? You would always have to get two opamps. The Fosi has 4 opamps as wel but two are soldered. Btw. The AUX output is not a pre-out. It is line level.
Can you not replace soldered op amp?
@@MasterofPlay7 I cannot but maybe some people can with magic soldering skills.
How does this compare to an older receiver and a $10 Bluetooth receiver of powering some outdoor speakers. I see these are around 40 watts per channel and $80. There are so many cheap 100 watt non HDMI and older HDMI version receivers for under $40. Size is a huge factor. But if it isn't, would the older class AB tech yield better sound quality? These tiny amps are great, but you still have to deal with the power brick, speaker wires, and power cord. Trade off here?
Am I the only one wondering whytf the Ayima turned on when toggling the switch while it's UNPLUGGED ?
Would like to see some bigger amp reviews
Hey Randy - would you do some op amp swapping yourself and then give us your opinion on them both?
I have technic 1210 with adam audio t7v active speakers with a fosi phono x2.
What amplifier would u get to go with this system ?
I tried the following BT30d pro, A07, A07 pro, smsl da8, smsl a300 all of them went back to amazon. The a07 the wife kept. I find these D amps sound annoying after a few hours of listening. My Pioneer Elite AV VSX receiver from 1999 still sounds good after hours of listening. But my search for a small amp goes on and this week my schiit gjallarhorn arrives. Hopefully it's a keeper. The cheap Chinese stuff I'm done with.
You now have tone control
@MasterofPlay7 I have 10band eq tone control through the wiim pro.
I found my Geshelli J2 AKM dac made all the difference in taking out any harshness from A07/A08 (I also rolled op amps to OPA1656)
Hi, love your rreviws. I went for a Fosi BT20a Pro after having an Aiyima T9Pro. I prefer the sound and the push of the extra watts. However, my Fosi now has almost zero volume when using a bluetooth connexion but works fine with and RCA lead connexion. Any ideas why, please?
Did anyone else catch the Aiyima power on when the toggle switch flipped on but not connected to power @ 2:15
yeah. that happens sometimes. little bit of juice left in the caps
The DAC performance never gets mentioned. So how are they?
The 5532 is a 50 years old amp that was good when it came out. Now it should be illegal to use for Hifi, it can ruin every good signal you send into it. It measures bad and it sounds very
bad. And why does people still use it then ?? - because it is dirt cheap, and some people still think it is good. Tubes and some other old components still sound good, but it is NOT true
for old op-amps.
I have bought a few Breeze Audio TPA 3116 based amps, and they sound very good ... if you change the 5532 to an LM4562 or similar op-amp, or better yet a discrete op-amp.
Fosi BT20A Pro or Audioengine B1 which is better I have Audioengine A2+ speakers
Hi I biought a fosi v3 they claim 300w per chanel, thsi amp barely puts out 20 watts, the sound quality is great, i have tried this with 4 ohms, 6, and 8 ohm speakers, I am quite dissapointed with the power, are these amps supposed to be used with a preamp?
So, I bought the Fosi Bt20 Pro, and the conclusion is that it's just terrible. Ok, I went from an Luxman class A amp with Bluesound Dac. But the Fosi with Bluesound just sounds bright/distorted, no "soft convincing sound. Like walking on a nailmat.
The positive thing is that you don't need to be afraid the kids destroy it.😅
you really are funny 😃 and give fair rewiev. thanks
Nice, I have a Fosi showing up later this week, so I'm happy with the outcome in this review. Had a little bit of fear when I started watching 🤣
They’re both very good. Just a little different
Piggybacking on Cloudy's comment, I too have a BT20A coming soon, and am hoping I did right by thinking that the "pre-out" 3.5 jack can be tapped as if it were a Tape Out. Right? Wrong? Thanks!
I got the fosi bt 20 As a week ago and it sounds great hooked to my Polk xt20 's
Hi. What’s your recommendation 2.1 speakers for Fosi BT20a ?
How does it compare to the Upgraded Version Fosi Audio TB10D ?
How about a video for a $25 price point?
Love the channel mate.
What would you recommend as a decent speaker pairing on a PC with the Aiyima A07 pro speaker wise?
Debating with myself whether to get a pair of Qacoustics 3010i or not. 🤔
Ty Randy - almost like I asked and you answered!
Can I use one as an external amp for my AVR hooked to a pre-out?
who wins yamaha 801 vs svs soundbase ?
is it a good match for bowers e wilkins dm603 s3?
The Fosi swappable op amps are dual op amps, and there are two others soldered to the board. Not sure about the configuration of the op amps on the Aiyima. Fosi have confirmed that , despite the fact that they are dual op amps, both must be replaced at the same time (both the socketed ones, I mean). Much as I like the Fosi, not entirely sure these are the best Class D amps. I suspect a Purifi Eigentakt might knock them for six, but then they are also 10 times the price at least.
Would there be a good difference going from Loxjie a30 to one of these? Rocking 3050i looking for cleaner sound, less distortion, better punch and control in bass.
is the pre out mono or stereo?
Can I connect an active sub in both? 2.1ch?
Randy,
Do you have an opinion on which amp would compliment our favorite Sony speakers better???
Probably the Fosi
I Tried The FOSI BL20A on a Set of SONY SS MB350H Speakers and It has allot o Punch for a Patio Environment.
@@cheapaudioman,
Thanks I have a pair of the Sonys still in the box not being used yet. Just grabbed them when they were on sale.
I was going to ask something similar. Would you say Fosi for the SSCS5 and Aiyima for the BS41?
@@andyanderson9446 spot on
Eu tenho o ayliyima b01, é bom se comparado a esses?
Hey Randy, just for giggles, how about doing a retrospective review of the budget class D setup that started it all for many? - the lepy / lepai lp-2020a paired to Dayton B652
Why are you calling it BT 20A ?
Love the channel.
Nice Sammy Davis Jr. at 3:44
I purchased the Fosio BT 20A pro and was disappointed for sure. Way over hyped up product.
Doesn't deliver. Sounded very tinnie. No we're to add a sub.
Don't waste your time.😢
I recently bought Fosi Audio BT30D PRO and I did not like it at all, no clarity in the sound and no power, totally disappointed
May be you can choose the AIYIMA A07 or AIYIMA A07 Pro
since both have the same amp chip, i'm pretty sure the diff between them is purely made by the op amps. the one with better op amps, will clearly sound way more better than the other one. also, capacitors have a significant role on the sound, the bigger (in Farads) the more "rounded" output sound.
i have bt20a pro and i intend to switch the op amps to MUSES02 (~90$ for both) or Sparkos SS3602 (150$ for both) and maybe use a linear power supply.
the problem is this amp can become way more expensive, from 100$ to almost 300$.
at 300$ I can buy a Yamaha AS201 which will sound better than any class D amp on the market (I simply cannot compare class AB with a class D, AB will always be superior)
from a tinker point of view, it will worth the mod price but from a budget + sound point of view it's clearly not worth the effort.