IB has the same potential for output as sealed, but since it's basically a really large sealed box you trade some peak output for more low end. I can imagine that single Focal was lacking in the bass dept, they aren't exactly known for their high excursion. This setup however should be capable of about 20db more than I'll actually use WinISD says peak output is the same as the ported Brahma I had before but with about 10db+ more output at 20hz, or twice as loud to the ear. I can't wait Thanks. I hope to never have to do it again though...LOL I'm pretty well stuck with 15" 12-spoke basket subs for as long as I own the car. not 12 spoke 15's, that sounds terrible!! I know right. With only 3000+ subs to choose from I don't know what I'll do Yeah, me too Really unsure how it's going to turn out. My first time doing the doors that extensively and I don't have a great vision for coming up with fabrication ideas. Here's a couple pics of the subs in their new home. Trunk is officially finished. Feels good to have atleast something to check off the list.