I have a SW-110 sub and for some reason I can’t get it to work. I have a Onkyo receiver with two sub ports. I used a double audio cable and have tried everything. It’s my understanding all I should have to do is connect the white to the white (LFE) of the sub and the other end of the white to either of the two subwoofer ports. I have tried both ports in the sub and both ports of the receiver. It is plugged in and switched to on. Is it possibly my cable. Do I have to have a single cable. I figured even though it was a double audio cable if I used both ends of one it should work right. HELP!