FI BL 18's 4th order wall? - Car Audio Classifieds!
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Old 01-21-2013, 08:23 PM
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Default FI BL 18's 4th order wall?

Right now I have my bl 18's in a tline wall designed by surreal, box is 23 cubes before port, corners for tline and sub displacement. I am thinking of rebuilding as soon as it warms up to a 4th order wall. Car is 2012 scion xb, subs call for 5-8 cubes each. How many cubes sealed per sub and what ported would be a good place to start? I had a 4th in my expedition that was something like 4 sealed and 19 or so ported but wasnt a wall. Thanks for help, I may just end up paying for another design and going from there
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Old 01-21-2013, 09:34 PM
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I'm not an expert on bps but from what I understand with 4ths you want to seal in whatever qtc alignment you normally would as if it were just sealed and the make the ported side either 2 or 3 times the volume of the sealed side tuned to the resonance of the sealed side. The lower ratio would yield a flatter response with less peak spl and the higher ratio would be more peaky, but overall louder. I would think 4ish on the sealed side and 8-12 on the ported side. The problem with this is that it may peak too high, as a bl would likey be much more suited in a quasi, or series 6th, than a 4th.

Again I'm no expert on bps so please don't start building off these statements unless it's experimental only.
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Old 01-22-2013, 09:06 AM
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They did very good in 4th in other ride. I probably get Buck or surreal to do a design after I check all my measurements again
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Old 01-24-2013, 01:45 PM
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Do a 6th man!!!
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Old 01-24-2013, 06:14 PM
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let me get some measurements this weekend, and I will go from there. I dont know what im doing for sure, lol
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