I just purchased a wireless F/X surround speaker. A problem - when I power down my home theater system, the F/X makes a very irritating whistling noise - like a bomb dropping in an vintage WWII film. My wife and cat both don't like this, and I may have to return the F/X if it can't be resolved.
I should note that I am using an Outlaw Model 7125 amplifier. Would it help if I use the line out from the AV receiver/preamp (an Outlaw 990)? But would that affect the sound quality?