I have an onkyo sr606 with some older model of their 7.1 speakers set up. I don't believe that is relevant though because before I hooked the speakers and receiver up I was getting the buzz on my TV speakers. All I had was my TV and cable box for a bit and had them hooked up with simple rca and composite cable. When it was on the TV speakers would still admit the buzz. The TV is plugged into the reciever with an HDMI cable and it's a Samsung LN46A550 Now that I'm waiting on a ps3 for a blu-ray player all I have is my cable box hooked up through the receiver with the RCA/composite cables and it's still doing it even with my old dvd player hooked up the same way. When I was messing with my cables though if I unplugged the HDMI cable while everything else was still running and the same the buzz would stop. Any ideas? The buzz is pretty audible and you always have to turn up the TV loud to drown it out.