yung current sealed sub box ko for a 12" is too big, when the 3rd row seats are deployed and reclined eh at upright position lang possible yung seats kasi tumatama sa box - which nakes it uncomfortable to ride in the 3rd row

what would be my options?
- modify my current box (tabasan? is it possible??) so that the seats can fully recline
- create a new box
a. pahaba instead of a boxy one
b. would an underseat box be okay? i know it would not be as efficient pero am not pushing the sub naman to ear splitting levels, just for me to feel the beats
- others??