well out of curiosity what size sub are you aiming for. i noticed you did not post what size. by the size of the box im guessing a 12. the mag and rl-p are both great woofers. also think about a pioneer 3000 spl with 1000 rms in 1.7 cubes after port and woofer displacement tuned to 32 hz. gets very loud and sounds pretty amazing. good luck