this has always been a problem pretty much since the day i got the speakers, but it has gotten steadily worst. but what i've also noticed is that at low volume (1/4 or less) sometimes the front left (control) or right speaker produces no sound, but by increasing the volume i can get it back.
i haven't checked all of my connections yet, as i don't think it is the problem, but i could be wrong.
any help would be appreciated.