Fishing For ExtCab Wall Tips....

[ChevyBoy95]

Want to rebuild my wall with the 4 B2 XM 15's that I have. Currently my strong frequency range is about 32-50 (with noticeable authority from 40-50), with my peak in the upper 40s, and heavy fall off after 32, and basically unloading at 29 and down.

Im not looking for stupid lows (25 and down) or anything like that, im trying to make it more enjoyable for ME. I really like upper 20's (28+) to about 40. With my wall loosing noticeable output as it gets below about 36, it is not as "fun" to drive around or play with.

Box will be driver side port, 4 15's, and i have about 15 cubes to work with after all disp.

So basically, those who have walled vehicles, what would you advise to do to gain lower end response?

I am not worried about it "not being loud" when i have 4 80lb 15's and ~12kw on tap. I would just like to shift my upper 40's peakiness (which could just be asshole cabin gain) to the lower mid 30s.

Current wall is ~14 cubes, 234.5 sq in of port (16.75 per cube)[58.6 sq in per 15] tuned to about 38/39 (also an issue due to space since i cant run a super long port and i dont want to choke it off with low port area).

[ChevyBoy95]

Have been doing a little messing around with my current shell (57x22x36.5), and i can work 14.2ft^3 with a 7x33.5 driver side port (same as current size), but 26" of port length (13.5" port piece back, then a 4" piece to the side), giving me a solid 34hz tuning

and in WinISD (taken with a grain of salt), plots a peak @ 36hz, and f3 @ 27hz with 0db @ 29hz, versus my current box which shows an f3 @ like 31, which seems about right, along with a massive peak in the low 40s.