Does anyone know the common causes for why an amp might start buzzing? I've got a yamaha amp (5.1/DTS) and recently its started emitting a quiet but noticable buzz from all 5 speakers.. no matter what source is selected. My DVD player is connected to the amp by an optical cable. Can't think what might be causing this.. I got a new DECT fone.. but I've just unplugged it and the speakers are all still buzzing. Can someone shed some light on this for me please? :nowords: