What about loudspeaker impedance?
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- Опубликовано: 28 июн 2024
- My speakers are 4 ohms but my amp is 8 ohms, can I use this combination? And what is ohms for heaven’s sake? Can I use 16 ohm speakers and why do they put ohms in it anyway? Well, time to shine some light on those illusive ohms.
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I have always been confused about the interaction between the speaker and amp and have sought clarity from other RUclipsrs. With your explanation and visuals, I finally got it. Thank you Hans.
Finally ! A proper and understandable explanation for the layman.
Truly excellent! This topic has puzzled me for years. You have prepared me to understand this topic at a deeper level. Thank you!
Thanks a lot Hans!!! Flawless explaination as always and very informative. Greetings from Argentina.
Thanks for dimming it down for me. Also thanks for not over simplifying it either. More videos showing off your testing please
After commenting I read some other comments, and well it is unanimous, Hans is good at explaining things in a way that most can understand and few will forget. I probably older than Hans but he commands my respect like a teacher or mentor. I love that.
14:43 mins of video, and each 10 seconds of it takes me at least 30 minutes to get my head around it.... Looks like i'm in for a long night!! Thanks Hans :)
Thank you. Now I know I can connect my 6 Ohm speakers to my 4 ohm system.
Eindelijk. Geweldig goede uitleg! Bedankt Hans.
I cannot stress enough, this guy simplified it so much for anyone I feel can understand it now. I been wanting to find a great informational video on this for some of my friends to help them learn and this is perfect!! Thank you very much.
Glad I could help!
Finally some intelligent explanation. Keep it up! Subbed.
Very well explained, you saved me from taking a bad decision. Thank you so much.
Systematic. Logical. Thorough. Amazing❣️
Glad you liked it
Dear Hans Thanks , clear and good
Hung from Hong Kong
Excellent explanation! thank You.
Bedankt, Hans! Mijn keuze is er niet makkelijker op geworden, maar ik begin te begrijpen wat speaker impedantie doet!
The phase and impedance graph has eluded my understanding until now. Many thanks for a lucid explainer!
Thank you!
Great video, thank you.
Excellent presentation ! well done... Best
Hans: I really do like your approach to this topic. Your examples helped me to picture what is going on. I am trained in electricity and electronics and already understand resistance(r)/dc and impedance/ac+dc(z) but I am new to audio. bought some old receivers and speakers that dont always match. Thank You Brother. More later. Dale. I do plan to contribute. Will learn a little first.
Reader: Be good to Hans. My experience and training ensures me he knows what he is talking about. Dale
Thank you sir. What a fantastic video.
Glad you enjoyed it!
Wow love this, you've got all the toys to properly tackle this subject, best I've ever seen, I'm an Aviation Electronics Technician and I love how the more I learn about electronics the more I realize I don't know :D very humbling video.... thank you for the knowledge!!
Glad you enjoyed it!
I'm thankful to those that explain topics of interest like this
🙏🏻🙏🏻
Thank you so much!
Very good video Hans.
Thank you!
Thanks
Excellent video
I bought some pre-owned Magnepan 20.1s, which are specified as 4 ohm speakers. Since I use them in my home theater as well as for music, I hooked them up to my Yamaha RX-a1070 AVR, which is supposed to have dynamic power of 210 watts at 4 ohms. Since I listen to music at relatively loud levels, I guessed there might be a problem with overheating. Sure enough, the Yamaha got quite warm. So I bought a Emotiva A-300 which provides 300 watts at 4 ohms (obviously, I'm more interested in value than seeing how much I can spend). I still drive the center and surrounds on the Yamaha and only the Maggies on the Emotiva and problem solved. Neither the AVR or the Emotiva gets hot, even at high volume and the Maggies sound fantastic.
Thank you very good
Thanks again....😊👍
Thank you Hans!
I listened to parts of your explanation two or three times, then the sound test; first on my tv, then on my tv through my stereo, then via my my computer through the stereo and finely for the first time through the 4 ohm output.
Like so many others below understanding loudspeaker impedance for my self; has given me the courage use my 4 ohm output.
Someone who is a genuine expert is almost imposible to find, I have asked high end retailers that have sold me my equipment and their advice amounted to um not shore ,safer to stich to 8 ohms.
In many of your of your videos much of the content goes above the head of a computer illiterate like me but there is always something that goes klick and you have resolved some question a have been trying to answer.
You continue to be my first "port of call" for information.
P.S. I should have added that the speakers are 6 ohms (Focal Arias out of a Prima Luna integrated amp)
I presume you have a tube amp. In that case nothing will break using the 4Ω output. Since loudspeakers have an impedance that very as function of the frequency, it is best to try out what sounds best. Especially the lows are influenced here.
@@TheHansBeekhuyzenChannel yes a Prima Luna integrated 100 , with 4 & 8 ohm outputs supplying 6 ohms Focal Aria speakers .
Note. Having now tried using the 4ohm outputs for the first time I think it has improved my sound. Occasional recording 's I was feeling something amiss but I think it feels less breathless (?) Now.
Keep up the good work 🙂
J
Beautifully explained, Hans.
I have an old 80's Krell Power Amp that needs some new Cap replacements due to old age. In its prime, it could drive very awkward loads with ease. 2 ohms would suck a huge amount of power from the amp & wall, and things would become very warm as a result. Any lower and you're approaching a short-circuit. I had a pair of AR 90's back then ... fantastic for the time. They had multiple 4 ohm drivers, though I understand there was a revision with the design. It was at this time I realised why power amps are so important.
Well that explains it 😁. Thanks
Hans i love you! :DDDDDD
Thanks for the very informative video.
My pleasure
i learn so much from you, thankyou
Happy to hear that!
Very intersting and the way it was explained is very very good
Glad you liked it
This was an excellent video, thank you sir. I dont think I will be ever bridging a stereo amp into a monoblock ever again
Glad you enjoyed it!
I'm a geek (Measured impedance curves and plotted the graph manually 40 years ago). I always find it interesting trying to explain to people that the reason a woofer or woofer/mid's impedance rises is in part because there a a big air core coil in series with it, just like a crossover. The voice coil, of course. Glad you mentioned that a steep phase angle occurring in the same vicinity as an impedance dip is tough to drive for lower end amps. Nice job. I'll refer this to friends/customers. I have trouble staying as concise as you.
🙏🏻
Excellent as per usual
Thanks again!
@@TheHansBeekhuyzenChannel Well sir, thanks to you, I have a very nice Raspberry Pi DAC since 2018
Very Interesting.
wow! you saved me a load of time and tons of readings to try to understand this.
I usually pay back great videos by SUBSCRIBING.
Thank you!
Thank you
pretty coool… Thank you
Thank you too!
HANS IS THE BEST! :-}
Nice explanation.
Maybe you can let us know what are the factors in a speaker that causes the difference in sensitivity. Why some speakers are rated at say 86db whilst another at 96db. Am keen to know.
Hans, great dissertation on Ohms. My question is two fold: I have paralleled two pairs of 8 Ohm rated speakers; 1 pair of Elacs and 1 pair of Fluance Bookshelf speakers. They are attached to a Denon DRA-800H Receiver. Posters all over the web have advised against this as the claim is Receiver and/or speaker destruction. The Denon also has a SW and another pair of Elacs connected to the A Speaker output. The Denon has shut down after playing CDs for awhile. I disconnected the A speakers , seemed better , but you can feel the Denon getting very warm. I now have a separate IOTA VXSA3 Preamp which is rated at 40Watts Per channel at 4 Ohms, 80 Watts at 8 ohms. I connected the paralleled speakers to this unit, and it plays slightly warm but not hot nor has it shut down. Will playing paralleled speakers in this fashion damage the Amp or Speakers . They playing very well together btw.
No. 2 - Where do I connect the red and black leads from my multi-meter to the AMplifier (Receiver) to measure the ohms with the paralleled speakers ? It is an old Radio Shack meter which works when testing batteries, so I presume it still functions? Thx for your time and advice.
Thank you Hans from Canada. A very good explanation of speaker performance. Also your other websites.
My Sony amp - a mediocre one - has a 6 amp output. My two sets of speakers are also Sony and are 6 ohm speakers.
I like to add the second set of speakers, and already have been told that I have to add a 3-4 ohm resister in series with the parallel wired speaker, for each one. This way the amp will perform well with about 6-7 ohm speaker impedance.
I like your detailed explanation, en dank je wel hoor !.
There is no point in burning power in a resistor. Just put two speakers in series per channel so connect the + of the 1st speaker on the + of the amp, the - of the 1st speaker, connect the - of the 1st speaker to the + of the 2nd speaker and the - of the 2nd speaker to the - of the amp.
@@TheHansBeekhuyzenChannel
Thank you very much Hans, I will do that. This way each channel has 12 ohms resistance. I guess it is better to have higher resistance than lower resistance.
Anton
super uitleg bedankt!
👍🏻👍🏻
I was able to get some Martin Logan’s esl 9 speakers for superrrr cheap which said to operate at 4 ohms. but we only have a denon receiver that runs at 8ohms. We use it in a system where the two esl 9 speakers are front left and right and then bookshelf speakers for surround left and right and then also a center speaker.
Most Marantz products can deliver sufficient current to work with 4 Ω loudspeakers, but I can't guarantee it though.
1to 8 speakers.. in between from3,4,5,6 its going to be in series. And from 1,2,4,8 parallel I hope that the way you mean. If yes I will do so.. Thank you for the instruction.. By the way i forgot to mantion those speakers will be connected on Chanel 1. Because the Chanel is busy for stage speakers. Thanks again
good VIDEO!
Glad you enjoyed it
The speaker is a complex load for any amplifier, the associated inductance and capacitance makes frecuency distorsion and if we also add the fact that it is an electromechanical component in itself the damping factor and the resonance of it complicate the thing a bit more. In short it looks like anything but a pure resistance at any frequency. All these factors have a negative influence in a performance it is usually does not exceed 25..30%...if you apply 1W electrical in the speaker you really listen sound equivalent to 0.25...0.30W in the best conditions. The rest power leakage for hot. Thank you for your clear explaination. I build tube amplifiers for hobby. Thanks a lot.
The efficiency spec already takes into account all those losses.
Thanks for explaining. Love the part where you say there's no 4 ohm or 8 ohm speakers. I was wondering if I could use 12 ohm tweeters to replace a dead 8 ohm one as it was closest replacement I could buy and based on your explanation I think it'll be fine.
If the sensitivity of the tweeter is the same. Sensitivity indicates how much sound pressure is produced by a given power, normally explained as dB sound pressure level at 1 meter by 1 watt or 2.83 volt
My biggest takeaway, is that the tone went silent at about 8k. I'm 70. I had heard about hearing changes, but it's humbling to find out how much my hearing is aging.
You might want to watch this video: ruclips.net/video/JxFCnZ5pBp4/видео.html It's therapeutic.
Thanks
Welcome
Hans I love your videos the question I have is my amp is rated at 4 ohms I have two pairs of speakers one pair are 6 ohms and the other are 8 ohms can I play a amd b speakers at the same time without causing damage to the amp I would love a video on this topic
No you can’t.
Hi! I have a question. If the impedance relates to the "efficiency" and power handling at each frequency, does that mean we can view the impedance curve as sort of an equalizer profile? If a speaker has a huge ohm spike at say 50hz, does that mean it'll play louder/quieter at that frequency than a hypothetical speaker with a completely flat impedance curve?
If that is true, does that also mean that connecting an amplifier with different ohms or connecting multiple speakers in series/parallel can chance the way a speaker sounds as if you boosted a couple of those frequencies where the impedance is higher?
Sorry if I worded that poorly
No, impedance is about current flow, not about frequency response although there might be some influence.
The problem with 4 ohm speakers on an 8 ohm amp, is the current draw from the transformer in the power supply and if there is no protection circuit you will damage the transformer or worse blow the output transistors.
Great Video ! I have an Yamaha rxa 770 (6-8ohms) and speakers 8ohms ( 90db 1m ) but i'm in doubt If i set in receiver 8 or 6, what`s the best way and why ?
As said, speakers never are 8 ohms. Try both options and use the one that sounds best.
Hello Hans, I am considering buying a pair of either the following speakers: Revel F328Be (8 ohm) , Dali Rubicon 8 and or SF Olympica Nova 5 ( both 4 ohm) speakers. Will any of these speakers be compatible with a Parasound A21+ amplifier? Which in your opinion is the better of the 3 speakers? Thanks.
These are all products I have not reviewed so I really can't say.
Great video Hans, thank you! Since amp manufacturers now provide a range (e.g. 4 - 8 ohms) and it is recommended to stick to this - what is the downside of powering 16 ohm speakers on such an amp? Is it possible that the amp can't drive those speakers to their full potential?
That's possible but normally it will work and it won't damage anything. But are there 16Ω speakers around??
@@TheHansBeekhuyzenChannel Thanks for the reply! I have an old hifi system (Aiwa NSX-520) and I want to power the speakers alone from a bluetooth amplifier. Each loudspeaker has a 6ohm woofer + tweeters and a 16ohm 'surround' speaker. I'm not sure what to do with the 16ohm surround speaker - I may not wire it up at all.
That would be my advise
Caught me off-guard at 12:40 with "Better provide shit-loads of current" - I needed that laugh today.
It was ship-loads of current if I remember correctly
@@TheHansBeekhuyzenChannel - That makes more sense.
I have XLS2000 crown Amp. and I want to install in parallel on 8 outdoor speakers, 8ohms-200watts.
the amp can handle 2-4-8-16 ohms any help will end my confusion, Thanks .
You can't do that for the combined impedance will be too low. You need to make a combination of parallel and series
Newbie question regarding impedance matching. I have a Yamaha RX V 3073 which I am currently using to run a pair of Dynaudio Emit M20s which have an impedance of 8 ohms. My Yamaha receiver has the option to use either an 8 ohm or 6 ohm impedance. Yamaha recommends I use the 6 ohm setting when using 4 ohms. Other audio advice I have received online suggests to leave the switch at 8 ohms in order to supply the speaker with the highest voltage and current. According to these sources the switch simply limits the power supplied to the speakers instead of matching impedance speakers. Will I damage either the receiver or speaker if I use the 8 ohm setting on speakers with a 4 ohm impedance? Which would be more likely to be damaged the speaker or the receiver? Logically it would appear that the receiver would be more likely to be more damaged due to overheating. I accidentally ran the 4 ohm speakers on the 8 ohm setting on the receiver for a few minutes and noticed some distortion at moderate volumes. Did I damage the tweeters? I haven’t noticed any further distortion after switching the receiver back to 6 ohms using the 4 ohm speakers. Is it easy to damage tweeters and how long would I have to run them distorted to truely damage them? Apologies for this convoluted post but am concerned about damaging my relatively new speakers. Any advice is appreciated. Thanks.
Just set the switch to 8 Ohms.There is no limitation of power as meant by you.
Thank you Hans. Great explanation. A few questions: 1. I don't see how the graph indicates your speaker is 8 Ohms. Can this be determined by this graph? 2. For a speaker that reads that it is 8 Ohms for example, I'd like to know what frequency manufacturers might use to measure the impedance. Many small analyzers use 1kHz and some sites state 250 - 400Hz but the impedance changes based on frequency. My concern is with measuring speakers that have no markings and measuring cabinets with multiple speakers. 3. What is the relationship, if any, of the impedance(say an 8 ohm speaker) to the resonant frequency of the speaker?
As I said in the video, there are no 8Ω speakers. There are speakers that measure 8Ω at a given frequency, usually 1000 Hz. The most important frequency area for impedance is in the lows since there the most power is needed. What you want is the wanted impedance - 8Ω in your example - with a low phase.
Great video! Loved your explanations except your quote from Einstein about energy. He might have said that, as most people who have studied and/or taught science have at some point have. However, it didn't originate with Einstein and was formalized as "The Law of Conservation of Energy" which preceded his birth by many years. Einstein did further this law by including mass as a form of energy, hence E=mc^2.
Interesting!
Thanks for clear explanation! Im wondering that is when we have ranges? Exaple in my case: speakers 4-8 ohm and amp 6-16 ohms. Is it good combination? Its confuseing when ranges are specified. Please help, thanks
Just remember that the lowest value specified for the amp should not be lower than the lowest value specified for the speakers. So when connecting a 4 to 8 ohm speaker to a 6 to 16 ohm amplifier you risk destroying the power transistors in your amp.
I understand, thank you!
Hi Hans. Thanks for another great podcast. I have just bought a tube amp and have both 4 and 8 ohm taps. My speakers, ProAc, are rated 8 ohms (6 ohms min). Which taps would you recommend using? Thanks.
What would be your guess?
Hi from New Zealand 👋. I was a bit confused, I have a amp/stereo receiver and it says by the speaker connection 8-16ohm, but I have 3 pairs of speakers, all 6ohm and didn't want to wreck my amp. Can they be used safely?
yes you can use them but as explained in the video you can only play them at mid range volume or less......playing at a high volume will most likely result in the amp heating up (your amp says 8-16 ohm but your speaker has a higher resistance of 6 ohm which will require more power from the amp). if you have a good amp it should have a safety switch off circuit when the power demand is too high otherwise it will overheat and it will fry it.
H what happens if we connect resistant in serial to speaker. Is it the suitable way to reduce speaker volume.
It is a very inefficient and expensive way to throw away power. Reduce the volume control.
Hello, what happens if I run 16ohm speakers on an 4-8ohm rated amplifier? Does it mean that the speakers will receive less power from the amp in comparison, or are there other acoustical issues? Thanks
Nothing really happens. Thee will less current and thus less power used but you will hear music all the same.
Thanks, I'm thinking about it. If I'm not mistaken amplifier channel 6 ohm can i use a 4 ohm speaker?
No, it means that the minimum impedance should be 6 ohm
@@TheHansBeekhuyzenChannel ok
I searched "damping factor" and this video popped up. Did I miss the explanation in the content?
No,this video is about impedance and not about damping factor. Sorry 😐
I have a question: I often heard that not only the power and current-delivery abilities of the amp is important to control difficult speakers, but also the damping factor. What exactly is that? As an example: The impedance of electrostatic speakers like Martin Logans drops to far below 1 Ohm at high frequencies (ca. 0.6 Ohm at 20 KHz). What kind of Amp is needed? High current-delivery and high damping factor?
My take on damping factor is that it helps control the woofer excursions and that damping factors, above say 50, aren't necessary. A good DF range?? Maybe between 30 and 50. I think that WHERE your speaker impedance drops is more important than WHAT it drops to. Low impedances at 20kHz where there's little energy shouldn't adversely affect amp performance. At 1kHz you're fucked.
I've got to be honest, I didn't get my head around that. My av receiver states 8ohms, my new floor standing speakers are 4ohms, so I set my av to 6ohms. Is that stupid or was that the right thing to do?
I am an expert, now that I've watched this video and didn't fully understand it, but I can certify that you did the right thing meeting in the middle. Sleep well my sweet prince, your decision is certified by a moron.
@@jgizzy funny funny funny!! hahahaha
what actually dictates voice coil impedance? wire thickness and wire winding count on the coil?
Those plus the mass of the cone, the strength of the magnet, the voice coil slot and so on.
@@TheHansBeekhuyzenChannel I meant initial impadence, before the voice coil is even set into the motor :)
3:28 "Unless we turn deaf" = infinite impedance
😬
I could hug you.
Not in Covid-19 time please but I appreciate the thought.
Will a higher impedance produce a more clear tone?
No
What are the pro's & con's of 8 ohm to 4 ohm. Did I miss it? My interest is a 18" 500 watt Subwoofer powered with a 1000 watt amp. Which is more efficient & would 4 ohm create extra HEATh that cooks the coils. Guess I keeps lookinin...
There are no direct pros's or con's to either 4 or 8 Ω, they are a part of a number of properties loudspeakers have and they all matter.
@@TheHansBeekhuyzenChannel seems shops like Zzounds sells they're 18" replacement speakers in 8 ohm. I am sure they think that will last longer. That was my thinking as well. I have narrowed my Sub speaker choice down to Celestion 30Hz to 2.5 Khz. Making me an Audiofile on the cheapy cheap... Just got my XLi3500 delivered scrach & dent for under $600 & 1000 watts a side 8 Ohm & a Gryphon Miesto Solo is 200 watts 8 Ohms.. I think for just under $200K it could offer 400 watts 8 ohm a side. To be sure the JBL 3 way built in amp gives 2000 Watts & that puts a smile on my face when that Bass Speaker Hits. That is my kinda Sound THERAPY!
So did i understand you correctly, ohms in a speaker fluctuates?
Yes, it varies with the frequency
so I could use 6 ohm speakers on my 4 ohm amp? it says it can take 2 ohm speakers as well... its just a matter of how much it will put out to it?
and would I be able to put out a lot of sound to a 6 ohm speaker?
Yes, no problem
That's why BBC create LS3/5a with 15 ohm to protect overload?
I really have no idea about what moved the BBC🤔
Whats nominal impedance range ??
I don't know. Where did you. get that from?
Heh I was with headphones and with the frequency increase test I stopped hearing it at around 16-17k... I'm getting old! :P
Before you get too frustrated, I would watch this video from about 4:15 minutes: ruclips.net/video/r_wxRGiBoJg/видео.html
@@TheHansBeekhuyzenChannel thanks for sharing :) very interesting content! I did think that little above 10k it was already so high and "up there" that musically it would probably be close to insignificant when listening to almost any type of music I think. Your other video explains that very well, in terms of how the music energy distributes on the frequency spectrum :) I'm looking into all this knowledge and learning what I can because I'm getting my head into some DIY speaker building experiments. One thing I haven't quite figured out is the following: if a single note on a guitar string is a given frequency... and then many instruments together are a combination of many dynamic sound waves shifting through various frequencies... how can a single speaker exciter "recreate" all those frequencies again into sound waves while having only a single surface? I know this is completely unrelated... and might be a very basic question... but I guess there's no harm in asking :P either way, thank you for the great videos and explanations! Cheers!
this is all so confusing; my fault btw
- i've blown a few amps in my time - but never really knew why ... i always associated too much wattage / sound level with overheating and / or blown speaker channels
i have just blown one channel on a nice Techniks amp so am a bit frustrated
i have 4 speakers connected to 4 terminals (A + B) on the amp ... all the speakers are 8 ohms and 150 - 200 or so watts each
the amp says 16 ohms on the rear and after watching this video (thanks Hans) i presume this is the problem
so do i buy an amp that uses 8 ohms?
i saw one online that said 8 - 16 ohms - but it says it will use 16 ohms if both A + B (ie four channels) are used ... which sounds like it will also blow if i push the sound level / and particularly the bass level up to high ... which i obviously tend to do
and also, given that said amp says it uses 8 ohms if only A or B is used (ie two speakers) can i double up ... putting two speakers (two wires) into each positive and negative channel
as you can see - i am a total amatuer ... and i have been playing records loud and blowing amps since the 1980s
- god bless you tube
Dont know if this helps, but it seems you are connecting 2 speakers in pararell for each amp, so 2 amps and 4 speakers. Not really optimal. If you connect them in series the total impedance change. You can search on youtube about ohms in series or pararell for more info.
@@okspicks what do you mean by each amp?
i dont understand anything what you said tbh ... it's me not you
what do you mean by "in series"
awotnot A normal amplifier is a stereo amplifier. it means it have two amplifiers inside, on for left speaker, and one for the right. There are a red and a black terminal for each amp. If you connect two 8ohm speakers to the same terminal, the impedance is 8/2 witch result in 4 ohm impedance for that output, this is called pararell wiring. But if you wire first to the terminals on one speaker, and from that one to the next, it is called series, and the total impedance will be 2*8 witch is 16ohms! so there is a massive difference
So most likely you have wired in pararell, and turned the volume up high, resulting in very low impedance in some songs, may be down to 2 ohms, and your speakers cannot handle the load. bang
@@okspicks so you think i should run speaker wire to one speaker (from each channel ; left and right) and then run a secondary wire from that speaker to the second speaker of each channel
i hope that makes sense
i kind of 99% know that's what you meant - but just checking because i'm such a clutz
and if so
... that should give me ohm impedance of 8 or 16 rather than under 8 or even far less
- correct
Shiploads??? LOL!
👍
should have titled the video "Watt about ...."
Ha ha Normal people
oh wow, this is only for geeks, two minutes into the video and I don't understand a word
It's not aimed at geeks but at people that want to understand audio tech
One thing I still don't understand. When having a 4 ohm amplifier, with speaker terminals behind the amp made for four speakers, what is the deal with that? Using four speakers from what I understand is that you have to use 8 ohm speaker in first slot and 8 or more ohms in second slot. So how dangerous is to use 4 ohm speakers in first slot and 8 ohm speakers in second speaker slots at the same time?
Don't ask me.....
@@TheHansBeekhuyzenChannel Jerk
My speakers are 4 ohms but my amp is 8 ohms, can I use this combination? so whats the answer?
If your amp is specified for 8Ωonly, you can not use 4Ω speakers.
This answers my question that i have been asking everyone,thanks Hans,i own a pair of Sony 4 ohm speakers and tried to hook them up to a 8 ohm Sansui amp,it sounded terrible,i got alot of clipping when i increased the volume,i ended up buying a pair of Yamaha 8 ohm Speakers.