Thanks for responding. The Onkyo is the TX-SR607. Not sure what AVR means, but the sub volume level was set by the Onkyo supplied speaker level microphone and set-up program. I've tried turning the volume dial on the sub itself down to zero, medium and high - with no change, except when set to...

I have a Harman Kardon powered subwoofer, which is connected to an Onkyo amplifier and theatre surround speakers to my TV. Everything was working fabulously - until I decided to install the subwoofer cable under the floor. I got a shielded specialist cable with good jacks, cost a fortune, and it...