AREA AND VOLUME CALCULATIONS
Although many enclosures can now be purchased in prefabricated form, building your own enclosure is often fun,
acoustically rewarding, or even a necessity to properly fit many vehicles. In order to build such a box there MUST be a
basic understanding of mathematic principals or you will wind up wasting incredible amounts of time and money by making
mistakes in the box design and assembly.
BASIC MATHEMATICS FOR ENCLOSURE CONSTRUCTION
– 9 –
The areas of surfaces or
openings are calculated
in square inches (in2).
Such calculations
depend upon height
and width values or
diameters for circles
d
w
h
w
h
AREAS
circle or a hole rectangular wall or area triangle wall or area
AREA CALCULATIONS
Circle or hole Area = 0.79 x d x d
Rectangular wall or area Area = h x w
Triangle wall or area Area = 0.5 x h x w
The volumes of
assemble shapes are
measured in cubic
inches (in3). Such
calculations depend
upon height, width, and
depth calculations for
rectangular shapes and
a diameter and height
for a tube shape.
AREA AND VOLUME CONVERSIONS
Technical data for speakers are often given in English and Metric unit values (e.g., inches and meters). Also, when
calculating dimensions we must often flip between size formats (e.g., cubic inches and cubic feet). To easily convert back
and forth between two formats you can use the conversion table below.
h
d
h
d
d
w
h
h
d
VOLUMES
tube shape rectangular shape triangular/wedge shape cone shape
d
VOLUME CALCULATIONS
Cylinder (port tube) Volume = 0.79 x d x d x h
Rectangular box Volume = h x w x d
Triangular box Volume = 0.5 x h x w x d
Cone shape Volume = 0.26 x d x d x h
VOLUME AND AREA CONVERSIONS
TO CONVERT YOUR NUMBER FROM: MULTIPLY YOUR NUMBER BY: TO GET A NEW VALUE IN
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
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