I am guessing from the spec saying 1800 Watts that they put a transformer in there that will handle 15 amps. This would give them about 1800 watts. It would be hard to drive all 7 channels at once at maximum output using music or movies. I am guessing if you do that for sustained periods of time you are going to have a melt down or a thermal shutdown. 300 watts is a lot of power for a speaker and if you need more than 7 channels at a little under 300 watts you will definately have a hearing problem in the near future. I would also wadger a guess that while running normal music and movies the 770 would be capable of handling well over 300 watt transients , but doesn't have the caps to keep it running for sustained operation. I can't imagine the capacitance required for 1800 watts sustained! Would be some monster caps.