ive had a couple recievers only play one of my kg4.2 after a certain amount of time. Today i connected them to an old realistic and they sounded great for a couple songs then i literally heard one speaker fade out. after an hour of one speaker the other one made some slight bass tones for about 30 sec. when one speaker is plugged into different sides the working side changes, it just wont play both L and R at the same time. I checked the connections inside the speaker and elsewhere and tighened a couple but that didnt make a difference!