I recently came across this categorization on the Whathifi forums. I realize this is a rather gross high level generalization without consideration of many variables such as type of amplifier, etc but I do feel generally brands and their designers have an overall idea of a design goal wrt the sound. I am curious to know what others on the forum think, and if you agree or disagree with this high level bucketing based on your experience.
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That's Quite exhausting Classification ; I'd rather try Putting them in 4 Categories. Again most of it is from Listening experience and Some Google research.
1.
Live Sounding (Forward, Bold, Exciting) : Naim, Krell, Cyrus, Bryston, CA, Roksan, Audiolab, AP
2. Neutral /Analytical : Most Good Class D, Hegel, Rotel, Parasound
3. Warmer Side of Neutral : Plinius, Hegel, Gryphon, Vintage Onkyo, Sansui, NAD AB amps, Rega
4. Warmer /Darker : Class A Amplifiers, Luxman, Accuphase, McIntosh, Pass Labs, Good Tube Amplifiers, AR, Esoteric
These classes are quite broad and for basic understanding purposes, any Amp Can sound different depending upon the Partnering Electronics(Source /Speakers) and finally Cables.
One Aspect is The Premium Or Richer Sound Can be in any of the 4 Classes and so is the Cheaper sound, (The Richness or Premium is akin to watching your own garden in True Oled TVs vs LCD TVs, it just appears Richer on OLED). So Naim may sound premium than Audiolab or Hegel may sound premium over Parasound; in spite of being in the same category. The 2nd aspect is the Control, the amplifier has on speakers, Which also follows the Richness, Amps with Good Control don't sound distorted (read shouty, not clipping) when driven hard or played loud. For ex I never felt McIntosh or Gryphon sounding shouty. The 3rd aspect is Being Musical or involving /engaging which any of the Amplifiers can sound when properly paired with matching electronics.
As usual YMMV...