I just bought an '02 Tahoe LT and everything is good except the audio. The larger front left door speaker is not working at all and the rear 8" sub flutters w/ bass so it needs replacing. I assume that one of the fronts is a tweeter but what is the other speaker - a woofer, mid-range, 2 or 3-way? I'm really just wanting decent sound - as good or better than OEM. If anyone has any recommendations I'd appreciate them. Thanks.