Bandpass Box?

Hi, whts up? I'm new to the forums, I run a small custom shop in my spare time (all I do is SPL guys) anyways i have been building box's ported and sealed for quite awhile and recently a good friend came to me with a cut through truck (camper top, entire back of cab cut out) he has a volfenhag zx4715 15inch sub, he is just wanting to use the one sub with 500rms from some old class d amp, He had a ported box in there for awhile with 2 12's and it didnt to much at all.  so i was told to build a bandpass box for it that it would respond to it better, ie-more spl with cheap stuff (thats what local meca judge said).  I have bassbox pro 6 and it is calling for a box with 9.62 cu ft in chamber 1 and 3.36 in chamber 2 with the port inside chamber 2, port would be 3x9x13.36 tuned to 38.04 Hz and have .20875 cu ft. of air space.  I have never built a bandpass and would like to know how this would sound, how loud it would be, and any suggestions.96 firechicken- kicker cvr 15's, spl 1600 watt, optima yellow top, 2.0 farad cap, sealed box and 146.8 db :)<---now upto 147.2 S2 meca class, going for 128 on a drive by :)

Bandpass boxes are usually really "peaky", meaning their frequency response isn't really flat, but that probably doesn't matter if this is an SPL system.

you wrote: I have bassbox pro 6

What is bassbox pro, and where did you get it from?

bassbox pro is a box design software used by kicker and many car audio shops, i had to buy it for $128 us.  goto yahoo and search for bassbox pro96 firechicken- kicker cvr 15's, spl 1600 watt, optima yellow top, 2.0 farad cap, sealed box and 146.8 db :)<---now upto 147.2 S2 meca class, going for 128 on a drive by :)

I have a Jl bandpass box with 12 inch w3, I have this in a semi truck that has a 86 inch bunk  that is  8 feet high, there was so much room to fill up, so i went bandpass, all i can say is this set up hits hard and sounds great.  I like the sound of my semi system better than my car. If you got a lot of space to fill a bandpass box that is  built correctly around the sub you have is the way to go.