Thinking about doing an IB setup for my Mustang. My first question would be how hard is it to seal these holes in the rear deck? A cheap option would be multiple layers of cardboard sealed with duct tape with CLD over top, but not sure if that would be adequate. Maybe 1/8 ABS plastic, tape, and CLD? Does it need to be 100 percent completely sealed?
2nd I know IB is a more SQ oriented build that requires much less power, what kind of power and size/amount of drivers would be necessary to get a good 130ish DBs? I know thats a variable answer question but not sure if anyone else with IB setups could advise their general experience. Also, Subsonic filter: unneeded or necessary?