Not sure what class G is (will need to google amp classifications) but I know the 2200 will handle 4 ohm loads, lots of owners run them with 4ohm speakers with no problems, not to mention they list 4 ohm in the specs.

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