I have a Technics SA-AX540 reciever and a Technics SL-PD8 5 disk cd changer. They are hooked together with a Monster Cables RCA patch cable (Red and White plugs). Ok so you know the set up here is the problem. For a while now I can listen to movies from my Sony BD-350 Blu-ray player fine, tv will play fine, radio plays fine. When I go to play CD's though the sound varies from low to high in a almost constent wave low to high to low to high ect........ Anyone out there know my problem. I think I may need to crack the case on both and do a good cleaning. Seeing as these are 8 years old.