ive got 5 boxs for 12's, one is slot ported tuned to 45htz, the other is for 2 slot ported tuned to around 36-38htz (not sure tho), one is sealed down firein box for 1 12 (great for trucks with the pockets under the rear seats, n the other 2 are sealed boxs for 2 12's, n one sealed for 2 10'z