Need some guidance on designing a 4th Order BP

[D-train-13k]

Hey guys... I have been pondering on this for some time and finally think i am going to go ahead and try to do a 4th order BP wall. I will be using (4) 15" DC XL's and (2) SAZ3500d's. The vehicle is a 2005 GMC Envoy. I need some guidance on how to determine the recommended air space for the sealed and ported chambers and how to calculate the port size for proper tuning. This will also be my first attempt at a wall as well. I am not rushing into this at all. I am currently in Iraq and i wont start my build until mid-late summer. I want to take this time to learn as much as possible to prepare for this.

My goal is to design a street beater tuned in low 30's and be very efficient for daily use as well as demoing at shows etc. So if anyone could give some guidance or PM me if you are willing to do up some designs for a reasonable price please hit me up. Thanks in advance.

if you want a BP to be LOW your gonna tune the ported side from 40-50 Hz just depends on how low you want it. a Good BP is a 3:1 ratio. i just built one and am building another thats way bigger. BP are pretty efficient.

basically youll figure out how much air space youll need per sub for a sealed box and just multiply that by 3. like my box is .75 per sub on the sealed side and running 2.25cubes per sub on the ported side. theres more to say but i guess thats a basic understanding of where to start off. im pretty new to BP as well, so im sure others will either have more to add to this or correct me.

[mr.p]

throw win isd out the window it will not even be close to what it will sound like in your car...