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Difference between amps

OK so let's talk amps.  I'm sure this has been addressed before but are there real differences between  multi-channel amps among the various brands in the mid-fi to high end markets with comparable specifications? Adcom, Anthem, Classe, Emotiva, Krell, McIntosh, Marantz, NAD, Parasound, Outlaw, Rotel, etc.  What are the differences in these brands?   I can site one difference.  In multi-channel Marantz amps, the specs never state "all channels driven".  They are notorius for misleading the consumer with their power output ratings.  But that's a marketing decision. What are the real or should I say physical or performance differences among these?  .  
pdn
mijostyn's avatar
mijostyn
8,226 posts
 
I wouldn't know. I only buy mono amps. They are the only ones that can be installed correctly. 
vinylshadow
420 posts
 
Don’t forget about Jeff Rowland amps. You might be able to buy 2 used Model 12 monoblocks for a good price which might be one of your best bets. 350W into 4 ohm.
scottscottsdale
103 posts
 
As a relative newbie, I can second MillerCarbon’s comments.  My only other comment is to make sure no matter who or what you buy, there should be a real return policy.  One week is enough enough.  Even 2 weeks is not enough.  
cakyol's avatar
cakyol
940 posts
 
Everything comes down to the power supply.
You need to scale amps like they are welding machines :-)

A proper amp needs to be able to have about 300-400 watts of supply for every 100 real watts rms class A/B, 600-700 watts of class A of output, all frequencies driven.

So, in a 5 x 100 REAL watts/channel amp, 1500 - 2000 watts of power supply is needed for class A/B and 3000 - 3500 watts of supply is needed for class A. Since that is one HUGE COLLOSAL supply, it is very difficult to have a multichannel amp having the full dynamic range over every channel. Look at the power supplies that come with Pass Labs amplifiers and you will know what I am talking about. And remember that those are only for 2 channels. Imagine what they would be like for 5 or 7 channels.

Otherwise, there are not that many differences between them. Amplifier design is pretty well established & known. The rest is dependent on the quality/longevity of the components used.

redwoodaudio
413 posts
 
@millercarbon
hey dude, my new harbeth 30.2s are under 90 dB sensitivity and easily driven with my pass xa30.8. Sound phenomenal. I’d take a breath before making all these new rules.

@cakyol
interesting points. Perhaps a bit overstated? What kinds of amps and speakers are you talking about?
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