Measuring Air Space

[jizazz12]

just tore out my old system and am getting ready for my new build, I'm getting ready to build a encloser for two d.c. lvl4 15's . my car is a 2005 Hyundai sonata don't have a lot of room width wise in the trunk so i will be incorporating the spare tire well into my sub box . what is the best way for getting a good idea of getting the cubic foot measurement of air space inside the well? i think i read on here that the best way is to use a one cubic foot box of styro foam peanuts and just count how many it takes to fill up the well is this right ?

[The enD]

styro foam peanuts

I've seen people using this technics. It must be woring.

[Saltine]

its close way but not accurate at all

[rusty959]

its not really counting the peanuts, its more filling the space with peanuts or something similar, and then removing them and putting them into a say, 12x12x12 (1 cubic foot) box how ever many times it takes. So say the peanuts from the well filled up the box 3.25 times the space is 3.25 cubic feet.

not sure how much that made sense....

but that will get you as close enough to actual volume as you need.

[brewer_brewer]

or you could use math.

lets say your well is an 18 inch circle that is 8 inches deep.

so radius of 18 is 9.

9x9=81 x 3.14(pie) = 254 times how deep it is (8 inches) = 2034 divided by 1728 (12x12x12) = 1.1775 cu ft.

simple fellas.

[Neo_frog]

And the peanut idea is terrible. Go buy a big jar of something like Cheetos puffs... Empty them into a big bowl, then try to dump all of them back into the jar.... MAGIC! You'll fill it up and still have half a bowl of Cheetos.

Unless you vibrate the shit out of it each time you transfer the peanuts into a box/well you'll never get an accurate measurement since the entropy jumps off the charts every time you move them around.

EDIT: Stick with brewer on the math. And don't worry about light curvature as it will be a negligible amount that won't affect the performance of the box.

Edited April 4, 2009 by Neo_frog

[jizazz12]

thanks to every one who chimed in on this i really appreciate it, the well in my car isn't round at all it's more of a horse shoe shape with allot of dips and dives so i think what I'll do is just frame it out the best i can and go from there. never really worked with fiber glass be for so this is going to be interesting.

[Neo_frog]

thanks to every one who chimed in on this i really appreciate it, the well in my car isn't round at all it's more of a horse shoe shape with allot of dips and dives so i think what I'll do is just frame it out the best i can and go from there. never really worked with fiber glass be for so this is going to be interesting.

Why not just build the box a little small and give the subs a little more power? Hell, you could even give them rated. Just because something looks bad on paper doesn't mean it won't do well in the car.

[jizazz12]

even if i did go a Little tighter on the box i would still need to use the well , need room for equipment. not allot of room in the o5 sonata.

[brewer_brewer]

use this for area:

length x height x width = ( ) divided by 1728

use it with small areas and then add all of the small areas together to get your total area.