I own a 1997 gtp with the 8 speaker premium, non-bose system. So after a few weeks of messing around I recently replaced the door speakers for 6.5" pioneers and blaupunkt 6x9's in the rear, didn't touch the 4's. But, turns out there's no sound going to the 6x9's at all! My question is about the little amp/booster behind the glove box: does it power all speakers or just the 6x9's? Tried researching with no clear answer. I'm planning on putting in a aftermarket HU later, will I have to bypass the amp/booster anyways? If so I'd like to use the stock 6x9 wiring from the amp/booster to wire the aftermarket HU.