I did listen to the M22s hooked up to the A1400 and other than the bass not really improving, although it was more prominent on songs that are truly bass heavy, the overall soundstage was much wider and more detailed from what I can remember of the way they sound vs. the 3808. I was at the back of the room and amazed at just how good they sounded at ~20' away.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70