So with all this said, one should just get the cheapest amp they can find since they only thing that makes a difference is the speakers. Am I correct?
This is the bottom line for the all electronics sound the same crowd. I've seen people recommend a $50 dvd player for someone asking for a mid level priced cd player, because everything sounds the same.
Personally I believed amps sound the same and ignored the bright highs coming from the system I bought for years. Then I got fed up and started trying things. Swapped out my XDA-1(as pre amp) and put in my old Denon 3803 running an XPA-3(using 2 channels only for stereo set up). The Denon sounded better and not as bright. Then I bought an Oppo 95 to replace an Emotiva ERC-1. Better soundstage, but still on the bright side, running the Oppo straight to the XPA-3, with Paradigm Signature S6 speakers.
Upon further experimentation, I found certain good quality but brighter tracks that would produce actual sibilance, or distortion at high frequencies above 82db. It was repeatable, and I wondered if my speakers were crap, and they retail for over $6000. I Read more and was fed up enough to try a different amp. Bought a Parasound Halo A21 and replaced the XPA-3. With the exact same system, same room, same volume levels, same tracks, the distortion was gone.(System at this point was the Paradigm speakers, Oppo 95 as pre and A21) Swapped the XPA-3 back into the system, and the distortion was back. Now this was distortion only at certain points of the songs but it was repeatable and that is when I finally realized that all amps do not sound the same. There was nothing wrong with the XPA-3, it was operating fine otherwise. The A21 had better imaging and the silky midrange made my jaw drop. These XPA amps are good for the money, but that's not saying much.
So, believe what you will, I don't mind. I don't know how the Parasound doesn't lose control of the tweeters like the XPA amp did. Some have suggested that they are not quite flat at the top end of the spectrum, I'm not sure. But if you find things somewhat bright, you can either change your speakers, or like someone in my position, I would rather replace the $600 amp than the $6000 speakers. I have no idea if Emotiva XPR amps are harsh at higher volumes. The USP-1 has been described as harsh by some who didn't like it. But no idea on the XSP-1 pre. I read a poster who claimed to know a former Emotiva employee who said Emotiva tunes their amps to be a bit hotter on the top because it sounds better in the home theater application. Again, no idea if that's true.
At the end of the day, I think when you bring products to market at such a low price point, compromises have to be made.