Hello I am hoping you can help - am at my wit's end with my 1 year old home theater system (a Samsung C-550). Within the past 2-3 months, there has been an increasing echo noise that completely ruins the experience. To fix I have tried: - adjusting sound settings from Samsung device - resetting speaker settings and doing the home audio test where each speaker blasts so that your experience is at center - using TV sound in addition to Samsung sound (does not work) - adjusting TV audio settings Other info: - the speakers have worked fine up until 2-3 months ago. My wife heard the echo first when it was subtle and now it is much worse - the issue is both for Cable TV + HT and HT only, although it seems much worse when using the Cable TV - I am not currently using the two back speakers as it does not fit our new room as well. This did not present a problem when we first started listening with just the woofer and front 3 speakers. Any ideas on this?? Thanks!