I've just bought a new Yamaha RX-V775 to replace an amp that died a few months ago. I've attached the subwoofer pre-out on the receiver to the Line In (Unfiltered) on the sub woofer. I've set volume to half and low-pass to 100%. The subwoofer power switch is set to auto and it is switching off/on when the receiver is switched off/on so it is getting a signal. However - no sound from the sub woofer.
I've set the speakers to small and manually configured the sub woofer. Still no sound. Please advise as to how I can troubleshoot this.