Onkyo 703 is not rated to drive 4 Ohm steady-state at full power. But to drive m80 steady-state at 100W, well, it's LOUD. Quick estimate shows that the SPL will be around 108dB at 12 feet, for both speakers. It is rated, though, for a pretty high dynamic power - 170W+170W for 2 front channels at 4 Ohms. I 'd think it's more than enough for faithful peak reproduction.