<font color='#000000'>I have just recently aquired a yamaha rxv-2400 reviever. It puts out 110 watts. I am also running the energy encore speaker sytem. However, i want to go from 5.1 to 7.1 but i want to keep the encore system. Do the presence speakers and the rear surround have to be the same power as the other speakers? Should i just buy 4 more of the satelites that the encore came with $235 a pair. I love these speakers but if i can go cheaper on the presence and rear surround that would be better. Thanks for all help and advice</font>