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
"...I can site one difference. In multi-channel Marantz amps, the specs never state "all channels driven". They are notorious for misleading the consumer with their power output ratings..."

Mass consumer products are made for the mass consumer, not top quality audio. You will find nothing on the spec sheet that will tell you anything about their sound quality or ability to drive a loudspeaker except in very general terms. 
When i was going on the look and search for a really good amplifier at low cost, my only possibility was used, but more than used, vintage and a vintage piece miraculously under evaluated...

I have chose mine after 2 years of search, reading ALL reviews about the main vintage legends and ,mythical products, from the tube Fischer amplifier to the Sansui last model....

It is near impossible to buy an amplifier today without listening to it extensively or if not, then put our faith on a few reviews because the product is new...Is this product would be sold as a mythical good one in 50 years? Or would it be forgottent with the mass of good amplifiers but only good not extraordinary good?


With all this thinking i catched a strike with the Sansui AU 7700... At 100 bucks....

It is my really first good amplifier and perhaps my last.... I bought another one 300 bucks in case so good is the first....

😊

In 1968 Sansui was in the top high end and in the mass market of top high end.... His products were sought and it is so true that the name become synonym of fiability, flexibility, organic sounding first, and refined organic sounding at his best.....It was.... It is till this day in my room....

No product at all actually in the market give so much flexibility and high quality for so little money, better than that no product at any cost give the flexibility and not ONLY good sound.....

Think about that..... I feel right with this purchase more than ever.....

Anyway to come back to the question in this thread most of us cannot afford to compare many amplifiers, and the way an amplifier will be listen to is always indirectly, trough a room, through some specific speakers, and specific analog or digital source? And least but not last,how can we assess his real S.Q. trough a not so perfectly embedded audio system ?

The best method is to buy a product very, very, high end or costly, non criticable design or a vintage legend that cannot deceive , between these two alternatives, beware.....

Actual mass market amplifiers has nothing to do with 50 years old mass market amplifiers for many reasons.... Quality is not the main flag here and now but profit except for very costly high end craftsman product but they dont hope to mass market anymore for decades now.... It is no more either the same people that bought audio.... They sought for efficiency more than elusive refinement.... Audiophile is now an insult.... It was not so 50 years ago.... Correct me if i am wrong, you are welcome....

By the way it seems there exceptions to what i speak about, i dont doubt that Schiit for example may sell quality products and develop a mass market but no way this amplifier can compare to the best of Sansui at all level....It is my opinion only i am not necessarily right like i already said....

My best to all...
Real life performance differences of multi channel amps depends on your application and supporting gear. Most of the modern multi channel amps are built for HT duty. They do a nice job of powering the sound of the chop of a helicopter blade or the impact of an explosion. The power ratings in 2 channels driven versus all 7 may be because in normal HT use, rarely, or only in very brief moments are all 7 channels be driven equally. Usually only the center channel is driven continuously. So, in their mind, continuous RMS across all channels is less important? Ultimately it comes down to how it sounds in your system. Specs can’t tell you that. But do not assume these types of amps can sound as good for 2 CH music as a dedicated 2CH amp designed specifically for music reproduction. Different applications, different design goals. So if music is at least one of your priorities, get a dedicated amp for your mains, maybe a decent integrated amp with HT bypass. This should help maximize your music experience. And then get whatever you like to power the rest for HT (or other) duty. If you are comparing between multi channels amps, you need to level match the volume from one to another. When you A/B them correctly, differences in HT applications can be less significant than you might expect.
"...In 1968 Sansui was in the top high end and in the mass market of top high end..."

Not sure if that was ever true.  The  Sansui AU 7700 could never drive the hi-end loudspeakers of the day like the hi-end Infinities. 
I think we rely too much on power ratings.

It takes 10x the power to double the volume, so do I care a lot between 120W and 100? No, really I don’t. In most homes, with a sub, and speakers run as satellites (not full range) 100W per channel is way more than enough.

Honestly, if you are running satellites, with subs, 75W amps per channel x 5 is more than enough unless you are running a mini theater in your home.

How the amps work with your speakers and how they sound is a much bigger deal. I like NAD for the use of nCore, and Parasound a lot.