Just got a Pioneer vsx-405 receiver and a Pioneer 5.1 surround system. The receiver has a subwoofer out (RCA) connection, but the subwoofer only has connections for regular speaker wires. Is there any way I can hook the sub up to the receiver, other than using the speaker wire. I have the subwoofer connected via speaker wire into the back of the receiver, but the sub is powerful enough for me. If I do find a way to connect the sub to the receiver via the subwoofer out RCA line, will it be bassier?