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fiberglass enclosure

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Old Oct 9, 2004
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fiberglass enclosure

i was just wondering how i would measure out the volume of a box before building it. hhhhrrrrrrrrrrrrrrmmmmmmmmmmmmmm

ok i want to build a fiberglass box with 1.6 cubic inches. since fiberglass boxes are usually round, how would i measure it out???
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Old Oct 10, 2004
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make a cardboard mockup and fill it with peanuts or something to get a rough volume.
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Old Oct 10, 2004
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lol isnt there an easier way to measure it. what i am trying to do is make an encolure that will fill in the area right behind the back seat. the back will be pretty much square. once i get to the sides of the trunk, then its starts to bubble up for the suspension. i was just wondering if someone has already done this and just give me the volume of their box. do i really have to sacrifice true sound for looks???
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Old Oct 10, 2004
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1.6 cubic inches? What you putting in it, a penny?
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Old Oct 10, 2004
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1.6 is about the right volume for a 12" idmax
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Old Oct 10, 2004
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yeah, 1.6 cubic feet. 1.6 cubic inches wouldn't work to well.
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Old Oct 10, 2004
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Lol I the sub wouldnt even fit in there... the screws to hold the sub in wouldn't even fit in there :P
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Old Oct 10, 2004
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Originally Posted by hondasux
since fiberglass boxes are usually round, how would i measure it out???

Volume of a sphere is 4/3(pi*(Radius^3)).

oh, I know, build it, fill the box with cats, then take the cats out and see how many cats fit in a 1 by 1 by1 box and divide the number of cats that fit in your box by the number of cats that fit in the cube. theres your answer from my smart-A$$. LOL
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Old Oct 10, 2004
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lol i only have three cats. anyone wanna let me borrow some. oh yea cubic feet sorry
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Old Oct 10, 2004
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You could build the enclosure, then fill it with water 1 liter at a time till you figure out how many liters it is. most sub spec sheets will list the cubic feet with the liter conversion.
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Old Oct 10, 2004
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You can't really calcualte it if it's a wierd shape, you just gotta guesstimate and hope for the best.
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Old Oct 10, 2004
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may help:
http://www.caraudioforum.com/vbb3/sh...measure+volume
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Old Oct 11, 2004
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I usually just estimate.

Its mostly a matter of peak performance versus looks. its not too big a deal, ive found, to sacrifice a small bit of the woofer's potential, be it max volume potential, or widest passband of frequency response possible to achieve a bitchin looking enclosure.

you can fine tune by filling the box, using fiberfill, invert mounting or standard mounting the woofer, there are all sorts of things you can do to fine tune that tenth of a cube to get the performance you want.
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