Placebo is a very powerful effect, I honestly won't believe there's a true difference between 2 amps with the same measured power ratings unless someone was able to pass a blind test like this:
- The same sound clip is played 20 times randomly on both amps, 10 times on amp A and 10 times on amp B
- Volume played would be the same for both amps
If the person was able to tell accurately which amp is which during the 20 times the track was played, I'll believe there's a true difference between the sound produced, paying it a couple of times only isn't enough for accurate results.
I wish someone who has access to lots of power amps and pre-amps would be able to do something like that, it would be extremely helpful.
KRP-500M | Kuro 9G 5020FD + e-lite mod | B&W 683 Fronts | B&W 685 Center | B&W DM601 S3 Rears | HSU VTF3 MK3 Sub | Yamaha RX-V663 AVR