Alphasonik ALPHA PSW610E - Manual (Page 9)

Calculating speaker enclosure volume is a five step procedure.
(Make sure you do not forget to subtract the thickness of the wood and
port displacement that you used.)
Step One: Measure Height
Step Two: Measure Width
Step Three: Measure Depth
Step Four: Height x Width x Depth
Step Five: Divide the results in step four by 1728
(12" x 12" x 12"=1728 which equals to 1.0 cu ft.)
Complete formula should look like this
Height x Width x Depth / 1728 =__________
Below are illustrated versions of all the steps that you should take.
(FOR EXAMPLE ONLY)
Step One
Step Three
Step Two
Side View
15"
23"
13.5"
23-1.5=21.5
15-1.5=13.5
The wood that we are using is 0.75" thick
The 1.5 that you see in the formula is the thickness
of the wood.
To calculate the thickness of the wood.
Left + Right=1.5
Top + Bottom=1.5
Front + Back=1.5
2.01 cu. ft. is the result for this enclosure.
Formula to calculate port displacement
3.14 x Radius x Radius x Depth=
________ / 1728=port displacement
3.14 x 2.25 x 2.25 x7=111.27 sq. in.
111.27 / 1728=.06 is the displacement of the port
2.01 - 0.06=1.95 cu.ft. is the final result for this
enclosure.
13.5"
7"
12"
21.5"
Patent No: US D478,556 S
Patent No: US 6,601,645 B1
Patent No: US 6,656,000 B2
4"
4.5"
.75 x 2=1.50
21.5 x 13.5 x 12=3483
3483 / 1728=2.01
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