i built this for my car for last summer and it was awesome the only reaons im selling it is because im building a wall in my camaro. i really dont want to sell lthis but i will if i get the right amount. it holds 1 12 inch solobaric woofer. i hit a 146 on the old AC meter with it and a 140.1 on the termlab about a week ago. the port is removable so you can change its tuning frequency which by the way is 38 hrz. realllllllllllllllllllllllll LOW, its a serious ground pounder. looking for 550 with and 06 l7 with your choice of coils or 400 with no sub, thanks!