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Subwoofer Box Conversion Chart

Make Sure You Get the Right Enclosure for Your Woofer

Constructing your own subwoofer box is the best way to ensure that your subwoofer will sound the best it possibly can.  The manufacturers of subwoofers release detailed information about a subwoofer so that a box builder creates the proper enclosure.  Making a subwoofer enclosure can require a lot of math, formulas, and conversions.  Below is some information that will make your box building experience easier and faster.

Formulas:

Triangle Area = 0.5 x (Base) x (Height)
Circle Area = (Radius) x (Radius) x 3.1415
Box Volume = Height x Length x Width
Total Cubic Feet Per Driver =  Total Cubic Feet / Number of Drivers
Total Cubic Feet = Total Cubic Inches / 1728

Unit Conversion Charts:

1 inch = 25.4 mm
1 mm = 0.0394 inches
1 liter = 0.0353 cubic feet
1 cubic foot = 28.32 liters
1 gallon = 0.134 cubic feet
1 cubic foot = 7.48 gallons
1 cubic foot = 1728 cubic inches
1 cubic inch = 0.00433 cubic feet
milli = 0.001
micro= 0.000001
kilo = 1000
Mega = 1,000,000

Port Diameter Inside Area Outside Area (1/4 in walls) Outside Area
1 in 0.785 sq in 1.767 sq in 0.89 x 0.89 in
1.5 in 1.767 sq in 3.142 sq in 1.33 x 1.33 in
2 in 3.142 sq in 4.909 sq in 1.77 x 1.77 in
3 in 7.069 sq in 9.621 sq in 2.66 x 2.66 in
4 in 12.566 sq in 15.904 sq in 3.54 x 3.54 in
5 in 19.635 sq in 27.758 sq in 4.43 x 4.43 in
6 in 28.274 sq in 33.183 sq in 5.32 x 5.32 in
8 in 50.265 sq in 56.745 sq in 7.09 x 7.09 in

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Staff writers at Sonic Electronix are experts in their field. In addition to a complete in-house training program, these experts typically have many years of hands-on experience in their specialty. Some come from car audio installer backgrounds, while others come with extensive retail experience.
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