I currently have a very basic surround sound system. Its an old Sony k840p,but it suits me needs.My right rear speaker sounds like a "garden sprinkler". its a ch-ch-ch noise.It only happens sometimes,different channels,and volumes.My computer tower is 3 ft away from the stereo,but it has been there for years now. I have checked at the wires for cracks or bad connections. Is it just a bad speaker,or interference?I also hit mute on the cable box,and i still hear the noise,when i wants to happen.Any comments and ideas would be appreciated.