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Basic Math Calculations
To build a subwoofer box some very basic math calculations must be made accurately referencing
the formulas below.
Volume and Area Calculations
Circle (port opening)
Rectangle
Triangle
Cylinder (port tube)
Rectangular box
Triangular box
Cone
d
h
d
Speaker parameters and box calculations often need some kind of math calculations in order to make
the numbers easy to work with (conversions between metric and Imperial/American units). Some
common conversions are listed below:
Volume and Area Conversions
To convert from:
Inches
Meters
Square inches
Square feet
Cubic inches
Cubic feet
Liters
Cubic feet
8 622 401 256
6
Area:
A = 0,79 x d x d
A = h x w
A = 0,5 x h x w
-
-
-
-
h
d
h
w
multiply by:
0.0254
39.37
0.007
144
0.00058
1728
0.035
28.3
w
d
h
w
to get:
Meters
Inches
Square feet
Square inches
Cubic feet
Cubic inches
Cubic feet
Liters
Volume:
-
-
-
V = 0,79 x d x d x h
V = h x w x d
V = 0,5 x h x w x d
V = 0,26 x d x d x h
h
w
h
d
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