Scotty...
I think what you're hearing and feeling with the old amps is lower damping factor and looser bass lag....If that's what you like....cool... But to me a slower sub-bass response is not as musical....and neither is rumble from drums. These newer amps I think are more accurate in the bass and will tell you how good/bad your speaker system responds. I love that tight controlled stop on a dime bass. I can't stand overbearing, brain-rattling kick drums that want to make me leave the room...I'm so tired of it....it's not music...it's just plain obnoxious....IMHO
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Anyway I gues the point comes back around to what you like...and that's perfectly ok.