you should have plenty of room for a sub under there because when you get ready to frame with you mdf just raise you seat height about 2 inches and the speaker ring will be 3/4 inches. add that to what ever the distance from the top to bottom of the enclosure will be, so if its 3 inches + 2inches + 3/4 inches thats 53/4 inches. only problem is your seats will set a little higher.
tip please make sure its at least 70 degrees outside if you will be working out side. and get those air bubble out.
tip please make sure its at least 70 degrees outside if you will be working out side. and get those air bubble out.