I always thought that the idea that one would sound differently than another was kind of silly. I chose to upgrade from my 6-year old Kenwood VR-507 5.1 A/V receiver however when I got my new HD-A2, and decided if I was going to upgrade, I was going to buy something that was seemingly a substantial step up. So I went with an Onkyo TX-SR805. A behemoth at 51 lbs and 130 watts of THXUltra2 certified power per channel, compared to my lightweight 100-WPC (HAHAHAHA) 18.5 pound Kenwood, I expected more clean power, but I didn't expect much difference in the tonal quality that my speakers were reproducing from similar sources. Boy was I wrong. In truth, it's going to take some adjustment for me. My speakers have taken on an almost completely different character, a much more toned down, more natural sound. Having grown accustomed to an almost piercing level of treble at even moderate volumes, I never realized how UN-natural my old Kenwood sounded pumping power to my Paradigms. Comparing soundtracks that I am used to with my old Kenwood, for example the battle scene in Pearl Harbor in DTS, I am shocked at the spaciousness and guts that the Onkyo adds at similar volume levels that wouldn't have even stressed the Kenwoods amps. I no longer struggle to hear dialogue at normal volume levels, I no longer have to crank it up to make it "loud". I know some of that is attributed to the amps being much more powerful, but I don't think that could be all of it.