It seems that people do hear differences between amplifiers, why don't you
and
soundgeek?

The question isn't really wether people hear a difference, it's about if
there's actually a difference or if you're simply hearing the things you want
to. I've always thought that I could detect a difference in sound between home
A/V recievers, but I always attributed the differences to the unit's DACs and
power output more than the amp itself. Even if there really is a sonic
difference between those A/V recievers (and I'm not entirely positive it wasn't
just my mind playing tricks on me), car audio amps don't have DACs that can
color the sound, and if the THD is below .10%, than it's inaudible and won't
have an effect. You can swap between an Audiobahn amp and a Zapco competition
series- if everything else remains consistant (like crossover points, the
speakers used, amp-power output, etc...) there should be no detecable sonic
differences between the amps. Obviously, going from a 75x2 amp to a 125x2 will
yield some difference, especially if you drove the less powerful unit into
clipping, but we're talking about equally matched units here. Would Richard
Clark really be gambling $10,000 on this if he thought there was a significant
chance of his "theory" being wrong?