I just purchased a 1989 Chevy Cheyenne pick-up truck, and the radio is D.O.A. I got a JVC cd/mp3/wma player with remote control from Crutchfield, which I will install today. My next upgrade is to get 4"x6" speakers for the dash and rear wall. I know these speakers won't give me a full range of sound. So, my question is; what can I put in the truck to give me a decent low end. I don't want to shake the city or anything like that, just add a little bass. Any suggestions would be appreciated.