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Old 06-17-2004   #1 (permalink)
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Question How to calculate cubic air space for sub-enclosures???

Just as the title reads.. I wanna figure out how to calculate air space to make sub boxed to spec according to the manufacturers specifications... Just wondering if anyone has had any experience doing this...
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Old 06-17-2004   #2 (permalink)
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1 cubic foot = 1728 cubic inches

multiply length, width, and heigth together to get your air space. NOTE: you will need to use the internal dimensions, not what you measure on the outside. so if you use 3/4 MDF, subtract 1.5 inchs from each dimension.
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Old 06-17-2004   #3 (permalink)
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Thats right. You want inside dimensions, not the outside dimensions. For example, take a perfect 1 cu ft box, 12"x12"x12' made with 3/4" MDF.

Outside (12"x12"x12") / 1728 = 1 cu ft perfect.
Inside ((12" - 3/4" - 3/4") x (12" - 3/4" - 3/4") x (12" - 3/4" - 3/4")) /1728 = 0.67 cu ft.

So even though the outside of the box take up 1 cu ft of space in the car, the woofer is really only seeing 0.67 cu ft of airspace inside the box. Huge difference.
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Old 06-17-2004   #4 (permalink)
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if you're doing it by the manufacturer's reccommendation, like what everyone already said, it's for the space inside the box which does not include the volume of the MDF.

note that some manufacturers will give you a number which already takes into account the speaker's displacement while others might not.

if you use the sub's specs to calculate a custom size box, you'll have to take into account the displacement of the speaker.
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Old 06-18-2004   #5 (permalink)
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youll never really have to worry about taking displcement into account. highest displacement ive ever seen is .21 or so cubic feet on one of the super subs. displacement is usually .12-.17 on average sized subs, and if you say you can notice a difference in .12 cubic feet, then youre full of ****. and if you are uber **** and forget to calculate displacement, then just invert the sub.
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Old 06-18-2004   #6 (permalink)
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And if your a columbian with 5000+ songs on CD's than you know your ****.
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Old 06-18-2004   #7 (permalink)
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Quote:
Originally Posted by LudlamTheory
youll never really have to worry about taking displcement into account. highest displacement ive ever seen is .21 or so cubic feet on one of the super subs. displacement is usually .12-.17 on average sized subs, and if you say you can notice a difference in .12 cubic feet, then youre full of ****. and if you are uber **** and forget to calculate displacement, then just invert the sub.

you're right but you might as well do it if the numbers are given...it's just good practice. it may be a tiny discrepancy but discrepancies can add up if you're rounding off on every little step. i try to maintain a good balance of perfection and efficiency. it's not hard subtract displacement.
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Old 06-18-2004   #8 (permalink)
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Thanks alot guys that helps alot...
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Originally Posted by civicstyle82
Anyone get as sick of them giving out stats as much as I am...it gets a little ridiculous...."Ausmus is 4 for 10 against Garcia when the guy in section G, seat 5 drinks 5 beers, eats 3 hot dogs and goes to the pisser twice"..$hit.
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Old 06-18-2004   #9 (permalink)
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Originally Posted by mohawkboom
And if your a columbian with 5000+ songs on CD's than you know your ****.

12,000 you damn canuck mohawk mutt
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Old 06-18-2004   #10 (permalink)
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Quote:
Originally Posted by turboslug
you're right but you might as well do it if the numbers are given...it's just good practice. it may be a tiny discrepancy but discrepancies can add up if you're rounding off on every little step. i try to maintain a good balance of perfection and efficiency. it's not hard subtract displacement.
example, if i building a box, and one dimension is 16", if for calculating displacement i have to do 16.2, id rather do 16, or 17. makes my life easier
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Old 06-18-2004
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