I'm suprised JohnK didn't mention this article, Do all amplifiers sound the same, of course your brain might be different where a blind audiophile panel could not tell the difference between a cheap Pioneer AVR and fancy dancy amps costing thousands.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85