Hello everyone, I have been visiting this forum for a while always getting good information from other threads about different products and getting ideas for my own home theater. Just sort of never posted many messeges. Here is my dilemma. My current system is Onkyo 797 reciever powering Polk Audio Satelite speakers RM7500. There is this constant popping noise coming from the sub, left/right speakers, or surround speakers. Depending on the DSP mode, the popping sound may come from different speakers. This happens when i watch TV, DVDs, or anything else for that matter. It does not matter which source im watching, the popping noise is always there. It gets louder if i increase the volume. It dissapeares while the reciever is in the process of switching from different modes automatically when watching DVDs for example. But once it gets into a mode, be it DD, DTS, or anything else the popping resumes. Its a constant popping sound and it has somewhat of a rhythm to it. It isnt random. Im really desperate to fix this problem, if anyone has any input, i will greatly appreciate it. Thanks for listening.