We have a 1999 grand prix gtp. Im sure this has been discussed before. Our grand prix doesnt have the bose system. The rear speakers work sometimes but most of the time they dont. Currently there are 2 4 ohm 6x9's the rear. What is the difference between the 4 ohm speakers and the 8 ohm speakers? I picked up 2 8 ohm speakers from a junk yard grand prix se. I was wondering if I could still use these or if they will sound like crap or hurt something?