I have a 2003 Chev. Avalanche and am adding a sub to my system. I have a short space under the rear seat to add a single 10" or 12" sub. I have been looking at the compact subs like pioneer TS-SW124D and earthquake SWS-12. I will be powering with a rockford 200x2 bridged at 500 watts mono in 4ohm. Keep in mind the rough box size is 20"long 10" wide at base and 5" high looking for suggestions please... Thanks