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View Full Version : i need help designing a ported box. all specs inside.



drkodin
01-03-2003, 12:15 AM
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.

drkodin
01-03-2003, 12:18 AM
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
01-03-2003, 02:41 AM
i dont know much, but i know jmac can help ya out....

motoxstud
01-03-2003, 03:56 AM
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...:D

RangerMan
01-03-2003, 10:21 AM
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
01-03-2003, 11:32 AM
**** Jmac................take a look @ my box post and give ideas please??? I can put up sub parameters soon.


J