embmicro

I just got a set of ProMedia GMX D-5.1 speakers from my uncle. After hooking them up I got a hiss from all five speakers. I though maybe it was because I was using an analog conenction, so I switched to COAX but I still have the noise, but now it goes away if the speakers idle for more than 3 seconds. I opened up the subwoofer and the controller. The subwoofer looks fine, no broken parts and so does the controller. In the controller I noticed 5 opamps, 5532, and the DAC, CS4228A. Could something like that be bad? I don't think it is the opamps as all the speakers have the same amount of static. Also when the controller is off the noise is gone so I am almost positive it has to do with it. Any help would be great. Thanks, Justin