Just picked up a used Onkyo receiver TX-SR805 that was to be replacing my old Yamaha. Hooked it all up tonight and cannot get the Subwoofer to work. Its a powered definitive sub and it works fine on the Yamaha but I get nothing on the Onkyo. On back of sub there are RCA inputs and 8 gold crankdown connectors. The gold connectors are not used at all but when I was troubleshooting I noticed that when I touch any of the positive connectors with my hands I get a light hummm from the sub but no beat. Wondering if I got a junk reciever, Is this a sign of the recievers Sub pre out being shorted or burned out