i need help designing a ported box. all specs inside.

[drkodin 10+ year member]

could someone do me a favor and figure out the dimensions of a ported box for me?

It will contain one 12" Audiobahn ALUM12Q sub (.18 displacement) and i want to use a slot port (tube port is an option, but i really dont want port noise).

this will be for a SQL setup. i'm thinking anywhere from a tuning of 28-35, whatever is best.

the dimensions of the box can not exceed:

29" width

15" height (14.5" is better as i may be able to squeeze in another couple inches on the length)

13" length

(total with 3/4" MDF is about 2cu ft before slot/sub displacement. reccomended is about that size.)

i just got a lot of new tools for christmas and have always wanted to try a ported box. i have two of these subs sealed (1.1^3 each) and i would like to see how the one ported will compare in output.

thanks in advance for any help.

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[drkodin 10+ year member]

sub specs:

Fs: 24.4Hz

Qts: .47

Qes: .52

Qms: 4.8

Vas: 2.26 Cu Ft

Re: 5.4ohms

Le: 2.7mH

Mmd: 186 Grams

Sd: 0.049 M2

EBP: 47

Efficiency: 96.4

Displacement: .18 cu ft

reccomended ported box size: 1.75+ cu ft

 

[motoxstud 10+ year member]

i dont know much, but i know jmac can help ya out....

 

[motoxstud 10+ year member]

u know what? jmac... on behalf of everyone u help... id like to thank you... u take ur own personal time and help us noobs out... thanks especially for my box which i am talking apart soon since i got some wood glue...//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[RangerMan Premium Member]

Originally posted by Jmac This is what I have so far ...

 

Construction Material = .75" MDF

Box Height = 14.5"

Box Width = 29"

Box Depth = 13"

Number of Ports = 1 (Slot)

Diameter of Ports = 13" x 1.75"

Length of Ports = 32"

Port Area = 22.75 square inches

Box Volume = 1.6 ft^3 after all displacements except brace

Box Tuning = 32.63 Hz

WinISD Estimated Peak SPL = 119 dB @ 47.8 Hz + cabin gain

WinISD Estimated Peak Port Velocity = 26.3 m/s @ 25.8 Hz

Jmac...does it say that the average cabin gain is about 6 dB?

 

[Corsica 5,000+ posts]

**** Jmac................take a look @ my box post and give ideas please??? I can put up sub parameters soon.

J