Scytzoh

Hello , I have 2 12 inch kickers that need 2.25 cubic feet each including the driver displacement, I am wanting to make a vented box for them. After the port displacement I get 2.7. Feet cubed now how and what formula if there is one can tell me the best size for the box? Height. Depth. Length
For 2 of them in same box but partitioned off from each other of course.

SOULMUSIC

iTrader: (8)

Here's a start...I'm also just starting to learn the math of box building..

http://www.the12volt.com/caraudio/boxcalcs.asp#rec

another...

http://www.reaudio.com/speaker_box/LPort_Box_Calc.html


.. Lots of things to learn bro..Have fun

Scytzoh

The first does not help I need calculator I can enter my volume and the result will show me the EXTERior measurements . Like I said I already know what volume I need. I need to know what to cut the boards at, and the best dimensions I.e more square than rectangle , if it better to be longer than taller ECT

veeman

iTrader: (3)

There are no calculators that do that (as far as i know that are free anyway). All of them require you to input the dimensions as that is the part that only you can know. If your trunk is only 36" wide, then you can only have a width of about 36". If the calculator gave you dimensions that did not fit your vehicle, that would be pretty useless. Essentially, you need to decide one or two of your dimensions and go from there. Since you know the volume, you now need to figure out what will physically fit or what you're willing to give up (this includes what is needed for the sub to fit as well...if you only have 12" of height, then a 15" sub won't fit in a standard box). Once you have the dimensions, then you plug them into the re calculator and it will give you cut specs. To give you an example, my trunk can have a max box width of 38", a height of 15", and a depth of 20" (what i'm willing to give up anyway)...the max volume of my box is therefore 11400 cubic inches (outside volume). If i use 3/4 thickness wood, then i have to subtract that thickness from my dimensions to get my internal volume, so my 38" wide becomes 36.5" internally, 15" becomes 13.5 etc...making my internal volume 9116 cubic inches. That divided by 1728 cubic inches per cubic foot=5.275 cubic feet. From that volume you have to subtract your sub's displacement and any additional braces or dividers in the box to arrive at your net box volume.

Scytzoh

Way too much info it's not that complicated... It's going in an explored so the proper volume box no matter what shape will fit. I simply want to know what mesurement I should use to cut the boards. Given it has to be 2.7 cubic feet each.. That's it... The mesuments is what I need.

d4rin

Use the recommended measurements the sub requires.

Read the woofer manual...

veeman

iTrader: (3)

Ok, here you go...5.4 cubes...cut your pieces: 2 pieces 12.5" x 50"( top and bottom), 2 pcs 13.5" x 50" (front and back), 3 pcs 13.5" x 11 inches (sides and divider). overall dimensions 50 wide, 15 high, 12.5 deep. take those dimensions and plug into the re box builder and you'll get the cut sizes with ports and all.

Lord Huggington

iTrader: (1)

It's not hard to design a box.

Find the useable dimensions.

Calculate port area.

Minus slot port space and sub displacement from sealed space.

Calculate port length, it will act like it's +half of the port width when measuring the port length from the center line, so use that to determine the tune.

Add the end-correction space (cf3) to the NET air space (end correction is slanted up the port wall), this is the other half.

Play with the depth of the box for the right space, but don't put bracing along this dimension.

Scytzoh

Thanks veeman that has been the most help thus far.. My the manual that came with the sub gives dimenions for sealed
Encloseur but not vented. In the manual it recommends a rectangular vent whitch is gonna be the next challenge

veeman

iTrader: (3)

here you go bro, it's a single side of the box (the calculator won't do dividers)...basically just double the length plus .75" for a single box with a divider. each side is individually ported or build 2 separate boxes to make moving it around easier. each one is 2.25 cubic feet net, tuned to about 36 hz, with a large slot port for low port noise.