Alphasonik Alpha 300 Series Instrukcja obsługi - Strona 9
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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)
4"
4.5"
Step One
Step Three
Side View
7"
13.5"
15"
15-1.5=13.5
Patent No: US D478,556 S
Patent No: US 6,601,645 B1
Patent No: US 6,656,000 B2
21.5"
23"
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
.75 x 2=1.50
21.5 x 13.5 x 12=3483
3483 / 1728=2.01
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.
Step Two
23-1.5=21.5
13.5"
12"
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