Okay, recently I picked up a 95 Civic EX and I'm looking to install some new gear plus what I currently already have. My head unit is an Alpine 9835 with the Alpine KCA-420i i-Pod controller (which I installed today). I already have a set of Polk MMC6500 components for the front, just not sure how much modifying will need to be done to get them in the door. I've been given the go ahead from the wife that as long as I put the two Polk Audio 8's and two Alpine amp in her Highlander that I can order new gear for my car (she loves the hand-me-downs). I'm thinking of going with the new Polk Audio PA500.4 to drive the fronts and using the head unit to drive the rear deck in the car. I'm also going to pick up the PA1200.1 for the subwoofer which I'm still undecided on. I want to keep the enclosure/weight down so I've been thinking of just running a single Polk Audio SR124.DVC in a 2ohm load. The rear seats fold down so the sub will be firing into the back seats but I'm just not sure if a single 12 will fill the cabin of the car. I've owned a Nissan pickup years ago with a single 12" Orion sub behind the seat which had no problem filling the cab with thump but the cabin in the Civic is a bit larger. I want to do a sealed enclosure to keep the box size down but I'd love to hear your thoughts, especially SR124 owners. Thanks.