The 988 is the same as the 2808 or is it closer to the 3808? either way it is still a Denon and is only lacking a few features the 4 digit counter parts are, other than that it still has the same Power supply and amp sections, the 988 will have no problems driving the M80s just as my lower end 1804 had no problems as well. Axiom recommends Denon, the entire line up, that can drive the M80s due to their own testing.

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