4th order BP for SPL but not a one note burp box for crew cab

LFR

CarAudio.com Regular
115
90
Lacey WA
I am moving into the design stage of the 4th order for the crew cab. I have hundreds of boxes under my belt, but only a few 4th orders. I made a few that did well in open cab style jeep installs for what it was. I used winISD. Im leaning more to the cone area style build then software. 2 12s with a sealed side about 2.25 and 2 or 3 times that for ported to 45ish hz. I would play with some designs and run them in my burban but I feel the cabs will be a huge difference on output. I have tried to look for data to help get more inside, but I haven't done well of getting what I am looking for.
 

Boominburban

CarAudio.com Elite
1,478
76
Athens, TN
That sounds like possibly too much airspace on the sealed side for two 12's ...
 

djdilliodon!

CarAudio.com Veteran
504
443
NY
2.25 between A pair can definitely work but it depends on the suspension. You can get away with 1 cube each. Now if the subs have 3-4+ layer spiders and thick surrounds you’ll need like 3 cubes each on the sealed end 🤣
 

djdilliodon!

CarAudio.com Veteran
504
443
NY
Phat surround and only 2 layers
With 2 layers it will depend if nomex or poly cotton (compliance can be tested easily, dial indicator and a weight or by pulling TS specs) and if the surround is of a lager roll they are usually thicker. If it was nomex with that type of surround, you’ll need more then 2.25 cubic feet in the sealed side for the pair if you want it to have some nasty low end.
 
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