Hi. I have just ordered 2 R-28F, 1 R-25C , and 1 R-12SW. I will later on probably add 2 surround speakers. My worry and question is that i was told that the Yamaha, RX-V481BL 725w 5.1-Ch receiver would be sufficient for running this, and i just wanted to be sure that it really is. I have bought the receiver from Best Buy so can easily return it and change it for something else.