Great job pointing out the power supply noise. I clicked on your Mean well 24v 90w recommendation but ended up going for the 24v 120w Mean well PSU. Apparently it's the one most recommended by Nelson Pass and had the best signal to noise ratio in the brick types if you look it up.
I have a similar Aiyima amp. The power supply that comes with it is rubbish, so I bought a 24v 10A switching power supply of the type used in 3D printers for about 30 dollars on Amazon. It made a huge difference to the sound quality.
Agreed, that's why in the video I stressed the importance of a proper power supply. Sometimes it's the components we least expect that can make a serious difference.
But you loose a lot of power not having 32v and even more with a 48v power supply that will get you more than 100 watt pr channel in 8 ohm 1% thd or 150-200 watt pr channel in 4 ohm 10% thd
@@gasolin75 I think if you have a "VERY" well made power supply, the 24V/10.42A (Digikey is selling those type of adapter brick) is enough for casual listening. (that's plenty 250 Watts right there)
Hello Mike. Thank you and your friend for this Fosi amp review, nice to know about the poor Fosi power brick. I just bought both this Fosi TB10D and a Aiyima A07 amp. I've been using the Aiyima brick for both amps and just switching the two, but thanks to you I will find a better brick for the Fosi.
Excellent piece on the impact on power supply audio fidelity in power amps, it still surprises me that knowable people place so little value on the most important and expensive active section of a power amplifier regardless of amplification class (A, AB, or D). It all starts and ends with the power supply---as your test shows. The power supply is the "Power" in audio power amplifier. A poorly filtered PS will induce noise into the signal stream, also it is usually the PS current delivery limits which are reached first when an amplifier reaches its max. Which your tests have clearly shown. These new Class D amplifiers, being produced out of China, based on the TI TPA325X are truly state-of-the art (SOA), whose maximum potential is only restricted by the external power supply paired with it---as the TPA3255 is capable of delivery 17 amps of current. To the manufacturers credit, they do note this. But with a proper high current low noise SMPS, these wonderful Class D amps, with their high fidelity and drive capabilities are right at home if paired with Magicos, Wilson Audio, Klispch, Sonus Faber, KEFs, Q-Acoustics, Dynaudio, B&W etc., speaker systems (see the LSA Warp One TPA3255 amplifier) You may ask yourself--if the PS supplied with these SOA amplifiers are anemic why do they package them with it? The answer is simple, to meet a market price point. The power supply is the most expensive "active" section to build of any amplifier by far. By the way, I'm using an Aiyima T9 Pro as a tube pre-amp, (with Voskhod tubes) driving 2x Aiyima A07s (Class D) with 2x Mean Well 36vdc 600va SMPS total 34 amps (adjusted to 40vdc) bi-amping Fluance XL8F 3-way floor standing speakers. Boy...I'm in audio heaven!!!! Not in my garage
Apparently Fosi Audio are soon to release a new version. I returned my BT30D Pro because it was not compatible with 48 volt 10 amp power supply needed to take advantage of the TI 3255 chip and to get max performance, not achieved with the 32v power supply.
when you made your sound quality comments, which power supply where you using? Not being up on my electrical engineering is the noisy stock power supply more of a technical problem than a problem that would be observed by most people in a real world application? and if I may another question from a newbie. So running these class D amps all comes down to Watts? 24 volts at 10 amps= 240 watts will be better than say 36 Volts at 5 amps= 180 watts?
For sound quality I used the PSU it came with. Which for general applications will work just fine. If you do want a more refined sound, I would look into a better PSU, however for the cost it works as described and did a great job when tested for sound quality. A noisy PSU shows up on the measurements, however most of these cheap Chinese PSU's are noisy so I suppose it's something that's a general trait with products like these.
I didn't hear any power supply noise coming from my speakers with the volume turned up all the way (no source connected, the power supply does make an audible noise by itself). I wouldn't use this for my main system but just for convenience and to take with me on the road.
How do they sound? Can I use it with my 6ohm 60watt speaker with heavy magnet around its woofer, I mean my speakers are heavy. I was wondering if these new generation amps can play them like conventional old school of 90's.
There is nothing like the old school amps of the 90s. Which is why I use an Adcom amp from the 90s in my main setup! Nelson Pass got it right back then.
How do I know I got the 1st or 2nd edition? I just got mine and I'd like to be sure (I got the good 2nd gen stuff). (Nothing on the manual or box mentions it.)
I have a feeling that they are using cheap components for the DC SMPS power supply. I have an old (much better 24V/10.42 Amp) brick and wanted to use it just wanted to buy either the amp itself or the board as kit.
why would you recommend a 24 Volt, 3.75 Amp, 90 Watt Mean Well GST90A24-P1M Regulated Switching Table Top Power Supply ? You would loose so much power,dynamics for power hungry speakers or just for alot of clean power
@@audioarkitekts the stock psu is not good enough i want something better but not to get less power 100 watt pr channel in 4 oihm 1% thd or 2x60-70 in 8 ohm also 1% thd, have 85db sensitive spakers some revierws say 2-3 db lower than rated, a little m ore than i need for the extra clean sound, not to play louder ruclips.net/video/y59mstqed6c/видео.html
Do you know about the OSD Nero Stream XD 200W Bluetooth, Wi-Fi Amplifier? It is an American Company at $240. Looks interesting at reasonable price. Thinking of buying one.
As far as I know, they are not, I would have to completely unsolder the bonding posts to get into the unit. A lot of work, in my opinion. However Fosi does not disclose whether the OP amps are replaceable, I am assuming they are surface mount, requiring desoldering to replace.
Nah... they are fairly inexpensive really. The things that come with these units are designed to be thrown away basically. Originally, I was getting audiable noise even when no music was playing. It was trash. But there are tons of switching power supplies on the market that will make these little amplifiers sing.
Good parts don't come cheap.. Anyway, they can be re used to another project (nice amp). Me, I'm very much opposed to another (one more electronic JUNK) power brick that will end up collecting dust in my cabinet drawer. If Fosi can sell me just the board itself (the TB10D Upgraded Version), I will buy one in a heartbeat.
Great job pointing out the power supply noise. I clicked on your Mean well 24v 90w recommendation but ended up going for the 24v 120w Mean well PSU. Apparently it's the one most recommended by Nelson Pass and had the best signal to noise ratio in the brick types if you look it up.
I have a similar Aiyima amp. The power supply that comes with it is rubbish, so I bought a 24v 10A switching power supply of the type used in 3D printers for about 30 dollars on Amazon. It made a huge difference to the sound quality.
Agreed, that's why in the video I stressed the importance of a proper power supply. Sometimes it's the components we least expect that can make a serious difference.
But you loose a lot of power not having 32v and even more with a 48v power supply that will get you more than 100 watt pr channel in 8 ohm 1% thd or 150-200 watt pr channel in 4 ohm 10% thd
@@gasolin75 I think if you have a "VERY" well made power supply, the 24V/10.42A (Digikey is selling those type of adapter brick) is enough for casual listening. (that's plenty 250 Watts right there)
Hello Mike. Thank you and your friend for this Fosi amp review, nice to know about the poor Fosi power brick.
I just bought both this Fosi TB10D and a Aiyima A07 amp.
I've been using the Aiyima brick for both amps and just switching the two, but thanks to you I will find a better brick for the Fosi.
Always remember to plug the aiyma brick into the amp first to prevent any electrical arc. I had that issue with mine.
Excellent piece on the impact on power supply audio fidelity in power amps, it still surprises me that knowable people place so little value on the most important and expensive active section of a power amplifier regardless of amplification class (A, AB, or D). It all starts and ends with the power supply---as your test shows. The power supply is the "Power" in audio power amplifier.
A poorly filtered PS will induce noise into the signal stream, also it is usually the PS current delivery limits which are reached first when an amplifier reaches its max. Which your tests have clearly shown.
These new Class D amplifiers, being produced out of China, based on the TI TPA325X are truly state-of-the art (SOA), whose maximum potential is only restricted by the external power supply paired with it---as the TPA3255 is capable of delivery 17 amps of current. To the manufacturers credit, they do note this.
But with a proper high current low noise SMPS, these wonderful Class D amps, with their high fidelity and drive capabilities are right at home if paired with Magicos, Wilson Audio, Klispch, Sonus Faber, KEFs, Q-Acoustics, Dynaudio, B&W etc., speaker systems (see the LSA Warp One TPA3255 amplifier)
You may ask yourself--if the PS supplied with these SOA amplifiers are anemic why do they package them with it? The answer is simple, to meet a market price point. The power supply is the most expensive "active" section to build of any amplifier by far.
By the way, I'm using an Aiyima T9 Pro as a tube pre-amp, (with Voskhod tubes) driving 2x Aiyima A07s (Class D) with 2x Mean Well 36vdc 600va SMPS total 34 amps (adjusted to 40vdc) bi-amping Fluance XL8F 3-way floor standing speakers. Boy...I'm in audio heaven!!!!
Not in my garage
Hey Larry, thanks for the comment and the support on power supplies! I am super happy you have found a place in your system for these little gems.
I put one in my bedroom. The form factor is really great compared to A/B amps and it sounds decent too.
I prefer this integrated to my $7k tube pre and power set up. I mainly use vinyl with external phono. Yes my Fosi X2 phono is coming!
Apparently Fosi Audio are soon to release a new version. I returned my BT30D Pro because it was not compatible with 48 volt 10 amp power supply needed to take advantage of the TI 3255 chip and to get max performance, not achieved with the 32v power supply.
when you made your sound quality comments, which power supply where you using? Not being up on my electrical engineering is the noisy stock power supply more of a technical problem than a problem that would be observed by most people in a real world application?
and if I may another question from a newbie. So running these class D amps all comes down to Watts? 24 volts at 10 amps= 240 watts will be better than say 36 Volts at 5 amps= 180 watts?
For sound quality I used the PSU it came with. Which for general applications will work just fine. If you do want a more refined sound, I would look into a better PSU, however for the cost it works as described and did a great job when tested for sound quality. A noisy PSU shows up on the measurements, however most of these cheap Chinese PSU's are noisy so I suppose it's something that's a general trait with products like these.
I didn't hear any power supply noise coming from my speakers with the volume turned up all the way (no source connected, the power supply does make an audible noise by itself). I wouldn't use this for my main system but just for convenience and to take with me on the road.
I want to see it tested with a clean 84 volt 800 watt power supply how many watts in 8 6 4 & 2 ohms @ 0.01 distortion
How do they sound? Can I use it with my 6ohm 60watt speaker with heavy magnet around its woofer, I mean my speakers are heavy. I was wondering if these new generation amps can play them like conventional old school of 90's.
There is nothing like the old school amps of the 90s. Which is why I use an Adcom amp from the 90s in my main setup! Nelson Pass got it right back then.
How do I know I got the 1st or 2nd edition? I just got mine and I'd like to be sure (I got the good 2nd gen stuff). (Nothing on the manual or box mentions it.)
I have a feeling that they are using cheap components for the DC SMPS power supply. I have an old (much better 24V/10.42 Amp) brick and wanted to use it just wanted to buy either the amp itself or the board as kit.
why would you recommend a 24 Volt, 3.75 Amp, 90 Watt Mean Well GST90A24-P1M Regulated Switching Table Top Power Supply ? You would loose so much power,dynamics for power hungry speakers or just for alot of clean power
Well, because you don't need more than 50-80 watts for this amp. I wouldn't suggest spending more than the amp is worth on a ps.
@@audioarkitekts the stock psu is not good enough i want something better but not to get less power 100 watt pr channel in 4 oihm 1% thd or 2x60-70 in 8 ohm also 1% thd, have 85db sensitive spakers some revierws say 2-3 db lower than rated, a little m ore than i need for the extra clean sound, not to play louder ruclips.net/video/y59mstqed6c/видео.html
Do you know about the OSD Nero Stream XD 200W Bluetooth, Wi-Fi Amplifier? It is an American Company at $240. Looks interesting at reasonable price. Thinking of buying one.
I'll have to look into it, I've heard of OSD but have never experienced their products...
Can this be used with a DVS Dj setup which is turntables, laptop, analog dj mixer?
If you take the RCA outs from the mixer to the amp it could work, would you be using it as a preamp with powered speakers?
@@audioarkitekts actually it's a small setup. JBL control 1 speakers 150W 4ohm passive
Are op amps upgradeable in the fosi?
As far as I know, they are not, I would have to completely unsolder the bonding posts to get into the unit. A lot of work, in my opinion. However Fosi does not disclose whether the OP amps are replaceable, I am assuming they are surface mount, requiring desoldering to replace.
@@audioarkitektsdesoldering binding posts is one thing- desoldering a chip is another haha
@@bespey exactly lol
The sad part is that you would have to buy a power supply that costs as much as the amp.
Or more.
Nah... they are fairly inexpensive really. The things that come with these units are designed to be thrown away basically. Originally, I was getting audiable noise even when no music was playing. It was trash. But there are tons of switching power supplies on the market that will make these little amplifiers sing.
Good parts don't come cheap.. Anyway, they can be re used to another project (nice amp). Me, I'm very much opposed to another (one more electronic JUNK) power brick that will end up collecting dust in my cabinet drawer. If Fosi can sell me just the board itself (the TB10D Upgraded Version), I will buy one in a heartbeat.