I'm running into a problem with one of my QS4s, and before bothering the service dept., I wonder if anybody has any ideas. Sometimes there is audible interference that as best as I can tell is localized to the down-firing woofer. It's not always there, only about 50% of the time. I've double-checked the channel from the receiver with another speaker, and changed the speaker wire (plus the obvious stuff like tightening binding posts).
Anybody have an idea as to what's causing this, and what I can do short of sending the unit in?
