Hey, I was woundering how do you determin the tunning on a dual slot port box with only one sub? Is there a calculator online or equation to use to find the tunning?

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- 04-18-2008 #1
## Dual slot port.

Hey, I was woundering how do you determin the tunning on a dual slot port box with only one sub? Is there a calculator online or equation to use to find the tunning?

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- 04-18-2008 #2
## Re: Dual slot port.

i would imagine its just like a normal port just port area /2??? idk.

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- 04-18-2008 #3
## Re: Dual slot port.

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- 04-18-2008 #4
## Re: Dual slot port.

When using mutiple port you end up with longer ports.

example

5 ft^3 @35 with one 4x16 port is 22.5" long

5 ft^3 @35 with two 2x16 ports is 24.12" longLast edited by SPY; 04-18-2008 at 10:30 PM.

- 04-18-2008 #5
## Re: Dual slot port.

well what about those ports that has one opening on front of box but T's off inside the box with two openings i have seen some boxes built like that jblcamry did a design like that once for someone but i could never get a hold of him to ask him how he done it

- 04-18-2008 #6
## Re: Dual slot port.

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- 04-19-2008 #7
## Re: Dual slot port.

well the one i was tallking about was without a divider umm i was checking out brianchia's box design pics he has on his image host page and he has one of the boxes i was talking about i suppose i should holla at him to find out how he figured out his port area and length

- 04-20-2008 #8
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## Re: Dual slot port.

The formula for Aeroports [tubezz] is...

LV = (8466 x R^2 / Vb x Fb^2) - (1.463 x R)

Where:

LV = Length of Port

R = Radius

Vb = Volume of the Box

Fb = Frequency

For multiple ports, you divide the volume of the box by how many ports you want.

Enjoi.

[and double, triple, or even quadruple check your work. Rather do extra work than have a sh!tty tuned box ]

EDIT:: I'm an idiot... I can't read

Formula for slotted ports:

LV (Length of Port) = [(1.463 x 10^7 x {SqRt(A/Pi)}) / (Fb^2 (Desire tuning frequency in Hertz) x Vb (Internal Volume of Enclosure in Inch^3)] - 1.463 x {SqRt(A/Pi)} (<-- Square vent's A x Pi )

With the same rule that applies to the aeroport being divide the Vb by the amount of ports wanted.Last edited by IDSkoT; 04-20-2008 at 05:16 PM.

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