took the truck to get measured for the 1.5" MDF box that's going in the back cab. there will be 1 speaker behind each seat, firing up with the port along the back window. the amplifier rack will be between the speakers at an angle. each speaker will have around 3.5 cubic ft of airspace, tuned to 35hz. it will be flush mounted to the floor and cab to make for a flush intall. it will be carpeted to match the interior. i just wish i could do the building myself but i have no place to do any kind