View Full Version : A noob question for the masses!

Colt9699

01-13-2007, 11:55 AM

I want to make a sealed box for my rlp and i just dont know the formula for figuring out internal volume........

Looking to make a 2.1 cube sealed box for a 15" rlp.

any help would be appreciated.

Do you want that to be your net volume?

Anyways, Length X Height X Depth (inches)/1728 = cubic foot volume. What are your dimension restrictions?

Colt9699

01-13-2007, 11:57 AM

Do you want that to be your net volume?

Yes im sorry 2.1 net after driver displacment.

Megalomaniac

01-13-2007, 11:58 AM

(# x # x #) / 1728.

Colt9699

01-13-2007, 11:58 AM

i have a ton of room to work with so no real space concerns.

Colt9699

01-13-2007, 11:59 AM

now how do i back figure that to get to 2.1 net?

Lets say just enough space on one side to fit the sub, so 16.5 x 16.5 is what we will shoot for for the first two dimensions. So, multiply 2.3 (assuming the displacement is .2 for the driver) by 1728, then divide that by 15(subtracted 1.5" for wall thickness), then divide it by 15 again, and that answer will be the final internal dimension. Then, you add 1.5 to each dimension because of wall thickness. You end up with 16.5 x 16.5 x 19.164. Thats not optimal dimensions, just an example.

Man, I hope that makes sense to you.

acold7dusta

01-13-2007, 12:15 PM

FYI sealed doesnt have do be as precise as ported. you can be .3 off and i bet you wouldnt notice an audible difference.

FYI sealed doesnt have do be as precise as ported. you can be .3 off and i bet you wouldnt notice an audible difference.

Word.

acold7dusta

01-13-2007, 12:22 PM

just dont think too hard is what im saying. find the space where you want it to be whip up the length, width, height thatll fit in good. if its 2.0 your good. if its 2.5 your good. you're making a big deal out of nothing really. ported on the other hand though...

I'm just trying to get the general idea to him. Not trying to make a big deal out of it.

acold7dusta

01-13-2007, 12:25 PM

i know, the original poster though is try to get exactly 2.1, when in the real world, it wont be very different

Colt9699

01-13-2007, 12:30 PM

i think i may have done it

I went with

18x18x12.5 for a net of 2.133

Ctminime

01-13-2007, 12:31 PM

yea man ported boxes if you screw up area a little bit it throws off tuning and all that crap....

acold7dusta

01-13-2007, 12:32 PM

pondarosa

Colt9699

01-13-2007, 12:35 PM

please excuse my drawing skillz

http://i18.photobucket.com/albums/b134/Colt9699/sealedbox.jpg

Yeah dude, you've hit the nail on the head. Build it.

Colt9699

01-13-2007, 12:41 PM

i think im gonna

60ndown

01-13-2007, 12:41 PM

what about angling the back panel? whats the math on that?

Colt9699

01-13-2007, 01:10 PM

does this seem right for a cut sheet for the box i described above?

front 19.5 long x 19.5 high

back 19.5 long x 19.5 high

top 18 long x 12.5 deep

bottom 18 long x 12.5 deep

2 x sides 19.5 high x 12.5 deep

acold7dusta

01-13-2007, 01:17 PM

yea you could build it like that