9 fully amplified channels on the 4810 vs. 7 on the 4310. To run height or width channels on the 4310 you have to give up the rear channels, but with the 4810 you can still have rear chanels as well as height or width, IIRC from my glance at the owner's manuals. But to pay an extra ~$1000 for this priviledge is a bit too much to me.


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