Good question. I replaced my deck and added the changer myself and found the sound to be comparable, if not better than the factory with the amp. If it is a jbl, then keep it. Why not? The amp I took out looked like crap so I junked it after asking a stereo shop if it was any good. They said it wasn't. You lucked out, I guess.
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"I've got a lot to learn in so little a time. Oh well!"
