Now bear with me, this is kinda long. I've got a Videologic 5.1 speaker system with decoder connected to an Xbox and a Pioneer 545 DVD player. The Xbox is scart connected with the Advanced Scart adaptor to the RGB scart of the TV. The optical lead is connected to the decoder. The DVD player is connected to the S-Video socket on the TV, using a scart adaptor. The coaxial lead is connected to the decoder. Here's the problem. When I turn the Xbox on, I get a loud buzzing from all speakers which is evident from low volume that gets louder as I turn the speakers volume up... I understand about the hum that the system is known for and its not that. The speakers are not bearable with this buzzing. If I remove the AV connector from the Xbox, the buzzing stops. If I take out the Coaxial lead from the decoder (connected to DVD player), the buzz is lessened very much so. I've been playing all day trying to fix this, and if I swap the Xbox for the PS2, so it is set up in the same way the Xbox was, I get a buzz but no where near as loud as when the Xbox is hooked up. Still suggests it's a problem at the digitheatre end, maybe the Xbox puts more power through, I don't know... I can eliminate the decoder by just holding the end of the scart socket that is connected to the Xbox in one hand and then hold the end of the coax cable that is in the decoder in the other hand. I get the same buzz. No power going to the decoder either. Also I can hold the end of the audio lead that is connected to the sub/amp and touch the end of the scart from the Xbox and I still get the buzzing. I've just had the Xbox repaired as it had a noisy fan, and it didn't do this before. Could it be that when it was fixed, the shielding (rf?) wasn't put back properly? ,if the Xbox has shielding... Or is it more likley the amp? PLEASE, PLEASE help on this.