6. Calculating Enclosure Volume
25"
I-
11.75"
R1.5"
5.75"
]3.5"
I
To
calculate the volume of an enclosure, measure the outside dimensions (Length,
Wight and Height), subtract the thickness of the material then multiply the three
numbers together to get the volume
in
cubic inches.
To
convert to cube feet, divide this
number by 1728.
We will use the 1.7 Cubic foot vented enclosure for the PXW1251/PXW1252 as an
example.
Net Internal Air Volume: 1.7
fP
Vent Dimension: 3" 10 x 6-1/2" Long
Driver Volume (Vd) = 0.15fP
Eg: Material Thickness: 0.75"
External Length: 11.75" Internal Length: 11.75 -
(2
x 0.75") = 10.25"
External Width: 25" Internal Length: 25 -
(2
x 0.75") = 23.5"
External Height: 15" Internal Height: 15 -
(2
x 0.75") = 13.5"
Equation: (10.25" x 23.5" x 13.5") + 1728 = 1.882
fP
To
calculate the area of a cylinder (for a vent), the equation is:
Radius x Radius x 3.1416 x length
Eg:
Vent Diameter: 3.5"
00,
R=1.75" Vent Length: 5.75"
Equation: ((1.75" x 1.75" x 3.1416) x 5.75) + 1728 = 0.032
fP
Total Enclosure Calculations
To
perform a complete enclosure calculation:
You
must subtract any objects that would
consume air volume from the enclosure.
Net Enclosure Volume:
Gross Volume - Port Volume - Driver Volume (Vd) = Net Volume
Equation = 1.882 - 0.032 - 0.15 = 1.7
fP
11
PFW/PXW
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