PDA

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.

Duke
01-13-2007, 11:56 AM
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?

Duke
01-13-2007, 12:03 PM
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.

Duke
01-13-2007, 12:17 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.

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...

Duke
01-13-2007, 12:24 PM
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....

Duke
01-13-2007, 12:31 PM
Perkins.

acold7dusta
01-13-2007, 12:32 PM
pondarosa

Colt9699
01-13-2007, 12:35 PM

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

Duke
01-13-2007, 12:36 PM
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