With my brief period running Axiom's A1400 with my M80's and using my Denon 3808 as a pre/pro I could hear a difference at all volume levels, albeit minor at low volume. The bass out of the M80s was more substantial at lower volume with the amp. That was pretty much the only significant difference there was at lower volumes, not really worth the price of an amp for low volume listening, IMO. At higher volumes the difference was across the board, better bass and the mids and highs were cleaner, more open and airy. The M80s even seemed to have wider soundstage.
On the other hand I listened to the A1400 amp at onn's and never really heard the same differences. Whether or not this difference was due to room configuration/layout I don't know so YMMV.
