They rock, they are in a 1.0 cubic foot slot ported box tuned at 38 hz. I was amazed at the output from this setup. I did not even try behind the seats. Two of the subs would have fit, but I wanted to use all three of them mounted on the fiberglass plate. The subs are 12 ohms each so wiring 3 of them together created a 4 ohm load on my amp. If anyone is interested, I have one more plate and sub set up for sale. I was going to use both of them in the crossfire, but one is enough. These plates were never sold to the public. I have a friend that works at JL AUDIO and they built two of these in a training class. You will NEVER see another one...except in my car. It is painted silver...to match our trim and has 3 JL AUDIO 6WO-12's mounted in it. The plate is painted with automotive paint and clear coat!!! Very Slick!!! I will include a PDF of 2 different slot ported enclosures that can be constructed and fit in the Crossfire. The subs sell on ebay for over $100 EACH and are worth every penny. I will take $350 for the plate and the subs. Shoot me a PM if interested.