The 2308 is designed to deliver its rated power power into 2 Channels..
So if all
channels are driven its power output will drop by about 75%..
This is crucial if you are playing music, if mainly for the sound tracks of movies then you should be fine. The other points to keep in mind are..
a. Loudspeaker choice & specs for sensitivity & impedance
b. Room size
c. Average expected volume level
Just my $0.02..