I have a Sansui G-3500 receiver that I just picked up the other day, it has eight speaker contacts, room for 2 sets of 2 speakers. It will only play through the "right" contacts for each set. I'm only playing two speakers but it sure would be nice to have stereo sound. I don't have a whole lot of know-how when it comes to this, but I checked the fuses and all three of them were intact. Anybody know what's going on?