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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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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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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.
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.
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.
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 shit. and if you are uber anal and forget to calculate displacement, then just invert the sub.
__________________ the revolution is over, and so as to not inconvenience anyone, nothing has been changed.
thank you.
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 shit. and if you are uber anal 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.
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.
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
__________________ the revolution is over, and so as to not inconvenience anyone, nothing has been changed.
thank you.
Reppin Stage 7
How to calculate cubic air space for sub-enclosures??? 
