All I know is that when I ran the A1400 with my speakers they most certainly did sound more open and less compressed than with the 3808 alone. The 3808 does a great job but the extra power seems to allow for better transients etc. The speakers sounded much more like what Audyssey does for your speakers, only I never had Audyssey turned on. \:\)

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