I just bought a KLH R-5100 digital surround sound receiver. It works great except when I use my optical digital audio input (which leads to a ps2) I get severe interference. Its not a humming noise ...

I have been trying to get a low cost stereo reciever for my son. These are the lower end models. KLH also makes a lower end model. I just need something I can hook a cd-player to so my son can listen ...