*TJ_abs - Agree with monty_GTV. Do away with the rear speakers and get a subwoofer. You can use a 4-channel amp running a passive setup using the 2 front channels to power the separates and the 2 rear channels bridged for the subwoofer. To save space on your trunk, go with a slim 10" subwoofer on a sealed box. JBL and Lightning Audio have decently-priced 4-channel amps you can buy. They are much better than those generic V12s being sold in some audio stores. However, if you ask me of my preference for amplifiers, I would go with DLS amplifiers.