mx 15's 52w x 16h... the depth is 38 overall so did you do the math... how much air space that will be after displacment..... and your box there only shows 3 subs unless im missing somthing...... what are you gonna use for power any why mx's? i meant to put three instead of four...idk how to calculate displacement...and power wise im still looking and i started leaning towards the mx's because i read that their among the best LSQ drivers and the xxx is to much