I just bought a 93 with the a/d/s also. I want to replace the 7 1/4" woofer in the stock box and I stall the ph15 6 channel amp I have, run the sub off ch 5-6 and the rest of the car on ch 1-4. I have replaced the stock 4" everywhere. Do you know if a square shallow Kicker DVC woofer will fit...