Hi all...Recently I purchased an earthquake sub-80 subwoofer. During the install i was a little confused. I thought it would have 1 rca input that comes from the reciever. However it does not. Has the two, right and left rca inputs. I know some subwoofers have one some have two how do i hookup using the two? Currently I am using the speaker wire cable to go from reciever to the subwoofer, and the subwoofer out to the speakers. Is one option better then the other? Thanks for you time.