Alphasonik PSW815E, PSW810E, PSW812E owner manual Port displacement that you used

B	Calculating speaker enclosure volume is a five step procedure.
U	(Make sure you do not forget to subtract the thickness of the wood and
I	port displacement that you used.)
L
D	Step One:	Measure Height
I	Step Two:	Measure Width
N	Step Three: Measure Depth
G	Step Four: Height x Width x Depth
	Step Five:	Divide the results in step four by 1728

A(12" x 12" x 12"=1728 which equals to 1.0 cu ft.)

N Complete formula should look like this

E

Height x Width x Depth / 1728 =__________

N

Below are illustrated versions of all the steps that you should take.

C

(FOR EXAMPLE ONLY)

Step Two

L

4"

23-1.5=21.5

O

S

12"

13.5"

4.5"

U

R

E

Step One

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

Step Three

of the wood.

To calculate the thickness of the wood.

Side View

Left + Right=1.5

Top + Bottom=1.5

Front + Back=1.5

7"

.75 x 2=1.50

13.5"

21.5 x 13.5 x 12=3483

3483 / 1728=2.01

2.01 cu. ft. is the result for this enclosure.

15"

15-1.5=13.5

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

9

Patent No: US D478,556 S

enclosure.

Patent No: US 6,601,645 B1

Patent No: US 6,656,000 B2