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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 Conversions
To convert from: multiply by: to get:
Inches 0.0254 Meters
Meters 39.37 Inches
Square inches 0.007 Square feet
Square feet 144 Square inches
Cubic inches 0.00058 Cubic feet
Cubic feet 1728 Cubic inches
Liters 0.035 Cubic feet
Cubic feet 28.3 Liters
w
h
h
w
h
d
h
w
d
w
h
d
h
d
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 Calculations
Area: Volume:
Circle (port opening) A = 0,79 x d x d -
Rectangle A = h x w -
Triangle A = 0,5 x h x w -
Cylinder (port tube) - V = 0,79 x d x d x h
Rectangular box - V = h x w x d
Triangular box - V = 0,5 x h x w x d
Cone - V = 0,26 x d x d x h
8 622 401 256
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