My impression from reading on this forum, is that the speakers on the non-bose should be the normal 4 ohm impedence. Should be able to directly replace the speakers for better ones. Not sure if there is a built in crossover or not. Would think that it would have to have something to protect the front dash speakers. Could always put a capacitor in series with the positive wire on the dash speakers to block the base. Crutchfield has got those for like ten bucks and call them base blockers.
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