Hello, I am have been using the Logitech Z506 speakers for a couple years now and last night I suddenly started hearing an annoying whining sound. The sound plays on the 4 speakers without the volume controller (the 4 unplugged ones at the bottom). I have attached a recording of the center speaker when it is plugged in and would appreciate any input on fixing or replacing the speakers. The sound continues even when the speakers are not plugged into any devices and I have tried using a different power socket too but the results have been the same.
Noise.mp3