I'm thinking of adding a Onkyo M-282 2 channel power Amp (100w x 2) to a Yamaha 5760 in a 7.1 setup. I have JBL S-38's as mains. Will this be an improvement in the sound of my mains (If so how much of an improvement) and since the 5760 will not be powering my mains will it leave it with more power to power the other speakers. I figure since the 5760 power consumption is 400 watts (400 divided by 7 = 57 watts/ channel) in a 7.1 setup while 400 divided by 5 = 80 watts/channel with all channels driven in a 5.1 setup. The Onkyo M-282 power consumption is 300 watts. Is this thinking correct.