Hello there. I have a 5.1 surround set up using a Yamaha amp and Jamo speakers and sub. Recently my speakers have started to buzz/hum quite loudly. It's probably more of a hum than a buzz. The sound comes from ALL of the speakers including the sub when in 5.1 mode, and just the front two and sub when in stereo mode. The buzz/hum remains at the same level regardless of the volume control on the amp. It is even there when the amp is muted. I haven't changed anything at all in my set up. I've tried disconnecting everything from my amp except the speakers, still the same. Then I tried, one-by-one switching all my kit off at the mains. No joy. Then I tried disconnecting my wireless modem and cordless phone as I thought they may be inteferring. Still no joy. I even went to the extreme of switching off every mains powered item I have. Still the buzz/hum remains. I also disconnected the TV aerial but again no joy. Recently I was using a portable DVD plugged into the aux phonos on the front of my amp. Can this have caused it? Have I damaged my amp or is it faulty? Could it be interference from something in a neighbouring flat? I've never had this problem before. The buzz is loud enough to ruin my listening and it is really annoying me. Anyone have any ideas about how I can stop this buzzing? Thanks.