The box has 7.25in of mounting depth. There firing into the bottom of the seat with 2in clearance from the surround . I know of a guy with the same box but has 2 sa12s in it. Each box has its on side with port firing out the side into cab. I love how the e10s sound if i want get more output from the sa's ill just keep the es. Still new to sundown but not car audio just saying