BOSE rear speakers stopped working

My 94 G20 stock Bose rear speakers just quit working one day. The front door speakers and tweeters in pillars work fine. Does anyone know if there are inline fuses between the radio-cd player and the amped speakers that may have blown, or does one think the amps are 'gone'? Any info would be greatly appreciated. I'm not positive, but I wouldn't think that I blew the amps out playing 70's rock. Any ideas, anyone?
TIA