I have the same issue with a SHARP GS-9200 I picked up at the local "waste transfer station" (except less confusingly the rear speaker connections seemed to take just two-pronged plugs). Unfortunately, the unit did not come with the original Golden Sound speakers/ cables/ plogs so I could not count wires/ verify that there was no crossover inside the front speakers etc. I am also curious to hear what the suggestions are re ratings for the woofers and tweeters in 2-way front speakers, or whether both front/ rear are both rated 8 ohms (or perhaps only 4 ohms?).