Measure the height, depth and width and multiply them together. BUT you need to take into account the thickness of the wood and the port displacement if it is ported.

Posted on May 06, 2013

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Posted on Jan 02, 2017

In order to calculate cubic feet you must multiply the LxWxH (where L=length, W=width and H=height or depth) making sure all three numbers are in feet. For example: a box 3' long by 2' wide by 1.5' high would contain 9 cubic feet of space. (3x2x1.5). If one or more of the measurements is in inches then you must convert it to feet or the others to inches. If all three measurements are in inches multiply them and then divide your answer by 1728 to give cubic feet because their are 1728 cubic inches in a cubic foot. (12x12x12). For example the same problem above in inches would be: 36x24x18=15,552cubic inches. Divide 15,552 by 1728 = 9 cubic feet

Apr 25, 2017 | Office Equipment & Supplies

You cannot calculate cubic feet from only two measurements. Cubic feet is an area of volume, such as the inside area of a box. With only two measurements you get square feet, which is a measurement of area. A box 11 feet by 21 feet takes up an area of 231 square feet (11 times 21). If the box is 3 feet tall, then you can compute cubic feet since you take all three values and multiply them together. A box 11 feet by 21 feet by 3 feet would contain 693 cubic feet of space (11 times 21 times 3).

Feb 15, 2016 | Office Equipment & Supplies

Hi Alex. The 3 measurements you quote are all cubic feet so you cannot ascertain any fixed sizes from that. The figure is arrived at by multiplying the width x height x depth. This means that if the box is 1 foot high and 1 foot wide it would need to be 1.4 feet deep to total 1.4 cubic feet. If it was 6 feet high and 1.4 feet wide and 2 inches deep it would also be 1.4 cubic feet. As you can see the sizes are completely different and the combination of different sizes is just about infinite.

Hope that is of some help, although to be honest I don't see how....

Regards

Steve

Hope that is of some help, although to be honest I don't see how....

Regards

Steve

Jan 21, 2016 | Office Equipment & Supplies

First get the number of cubic inches by multiplying the three value provided.

17 x 13 x 8 = 1768 cubic inches

Then determine the number of cubic inches in a cubic foot:

12 x 12 x 12 = 1728 cubic inches

Determine the value in cubic feet by dividing the number of cubic inches in the box by the number of cubic inches in a cubic foot:

1768 divided by 1728 = 1.023148148148... cubic feet

17 x 13 x 8 = 1768 cubic inches

Then determine the number of cubic inches in a cubic foot:

12 x 12 x 12 = 1728 cubic inches

Determine the value in cubic feet by dividing the number of cubic inches in the box by the number of cubic inches in a cubic foot:

1768 divided by 1728 = 1.023148148148... cubic feet

Oct 17, 2015 | Office Equipment & Supplies

The formula is just what you posted

8 feet x4 feet x.5 feet=16 cubic feet.

8 feet x4 feet x.5 feet=16 cubic feet.

Feb 25, 2015 | Car Audio & Video

You can use this speaker in either a ported or sealed box. A sealed box would be smaller, (sealed box volume: 0.5 to 1.25 cubic feet) the larger the box the more base you will get. With a sealed box your amp has to work double hard as it would in a ported box ( 1.3 to 3.2 cubic feet) You will get close to double the volume in a ported box. Tuning a ported box with the size and length of the port will determine the hertz the speaker will play at.

Sep 15, 2014 | AudioBahn AW1206T Car Subwoofer

11 feet times 12 feet equals 132 square feet in flooring it is square feet . easy think of a box and it is 11 by 12 and ? tall so lets make ? 11 so cubic feet would 11x12x11 =1452 cubic feet

Aug 06, 2014 | Building Materials

for a single one in a sealed box should be looking at 5 Cuft not prted, it varies on the shape of the box, wedge, rectangle, etc and if its ported, 5 cubic feet is generalised in a rectangle box thats sealed, heres a link, it is a little difficult but once you work it out you can calculate the correct cubic feet for any sub in any shpaed box, check it out.

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

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

Jun 22, 2010 | MA Audio HK15X2 Car Subwoofer

It depends on the size of the subs- 8z 10z 12z 15z? whether or not you port the box is up to you- a ported box is generally louder than a sealed box -as you are coupling and tuning the sound from the rear of the driver with the sound generated from the front of the sub- but the box is also generally larger as well.Then aside from your preference of ported/sealed you have to account for the recommendations of the manufacturer as to whether the sub/speakers are meant to be placed in a ported or sealed enclosure. Most 10 inch subs do well in a box that yields .75 cubic feet to1.0 cubic feet.most 12z do well in 1.0 cu feet to 1.5 subic feet and 15z do well in 1.5 to 2.5 cubic feet. I have a set of 15z that require 4.25 cubic feet per sub-so its important to look into the manufacturers recommendations. The easiest box to make would be a sealed enclosure-and the sound quality generally yields a tighter more accurate bass sound along with increased power handling capability- try going to rockford fosgate .com and look into the woofer box wizard its a program that calculates air space for whatever size box you have room for-hope that helps you-good luck

May 11, 2009 | Car Audio & Video

The JL 12W0 needs 125 watts RMS. Sealed box it needs 1.5 cubic feet. Ported it needs 2.5 cubic feet.

The JL 12W3 needs 300 watts RMS. Sealed box it needs 1.25 cubic feet. Ported it needs 1.75 cubic feet. I wouldn't suggest running these subs together.

The JL 12W3 needs 300 watts RMS. Sealed box it needs 1.25 cubic feet. Ported it needs 1.75 cubic feet. I wouldn't suggest running these subs together.

Jan 17, 2009 | Jl Audio 12W3 Car Subwoofer

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