Rear Speakers only putting out bass

Hey guys what's up. My buddy wants me to check out a problem he's having with his car. I havent taken a look at it yet but from what i know is it's mid to late 90's Cadilac Presidental and he does not believe its a bose system. Everything is stock and like i said , i asked him if it was bose and he said he is 99% sure its not. Anyway wihout getting a chance to take a look at yet i was wondering if you guys knew what might cause two speakers(rear) to only put out bass and the problem started at the same time with both speakers. His fronts are fine, just the rears...any guesses?Jim

Best Buy MECP Mobile supervisor in store 820

jimmyb3rddegree@hotmail.com

If it has always been this way, there is a crossover somewhere in the system.  If it was normal full-range for a while and then it changed by itself, the speakers or the head unit amplifier blew.Support the12volt.com

Like I said...

DYohn wrote: If it has always been this way, there is a crossover somewhere in the system.  If it was normal full-range for a while and then it changed by itself, the speakers or the head unit amplifier blew.

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i know this sounds like a dumb question but it the car equipped with all factory equipment.   some people decide not to mention this stuff unless you ask em. car 1 = alpine 9807, mtx 404+mtx 311d, polk speakers, kappa 10"

car 2 = pioneer 7700, kicker 400x1, kicker 60x4, 10"compvr x2, kappa speakers