My new receiver arrived today and I've had great fun playing with it today. That was until I turned down the volume and head a buzzing from my sub!! I've since tested power cable, no sub cable and moving the sub around. Even just plugged into the mains no where near my receiver the buzzing still sounds. Any ideas? I've resigned myself to contacting Monitor Audio on Tuesday but it would be great to find a remedy. For what it's worth, the sound apart from the buzzing is sensational! The Yammy is a beast!!