I have two Yamaha YST-SW105 subwoofers that I would like to connect to my new Pioneer VSX-816-K. The 816 only has one Subwoofer Preout. I have that connected via an RCA cable to the sub's L/mono input. In my previous setup with a much older receiver I had the left mains going out of the receiver to the left input on the sub. Then I had wires going from the left output of the sub to the input of the speaker. I did the same thing with the right channel. However, I think there must be a better way. Any advice would be thoroughly appreciated.