Well...decided to increase my loan balance (ouch) and went w/ the JL Audio HD600/4, JL CS110RG sub-woofer, and professional install. They installed the amp under the drivers seat. The installer said the screws were just barely in the floor to avoid messing w/ the gas tank.
They wired 2 channels for the front BA components, 2 channels to power the sub, and the rear BA coaxals are powered by the Kenwood HU amp.
Holy cow! It was like a science class when the installer explained how to set the various frequencies (treb/mid/bass) from the HU. I finally got it setup how I like it.
Still haven't cut the all-season mats....just using a cheap mat for now.
Here's some pics:
(...w/ seat in normal driving position...)
(...w/ seat pushed forward...seat could've gone forward more too...)
(...the sub...)
I normally close the cargo cover while driving so the sub will be out of sight when I leave the car. It sounds good w/ the cargo cover closed.