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View Full Version : port calculation help pls..

jackson12375
05-08-2009, 01:12 AM
help me guys i want to come up with 35Hz i need the numbers please its urgent. thank you

http://img19.imageshack.us/img19/3415/kickersubupportback1.png

luv2shrOOm
05-08-2009, 01:31 AM
those are out side mesaurements correct?
wood thickness?

luv2shrOOm
05-08-2009, 01:35 AM
also sub dissplacement too

luv2shrOOm
05-08-2009, 01:47 AM
check u're pm's

jackson12375
05-08-2009, 02:36 AM
its for 1 kicker 15" l7 yes external

jackson12375
05-08-2009, 02:39 AM
should i go for 33hz or 35hz for more ground pounding?

luv2shrOOm
05-08-2009, 02:54 AM
lower is better for distance..meaning the "walkers" at the bus stops will hear you from farther..heh

jackson12375
05-08-2009, 03:04 AM
thank you very much for your help sir

IDSkoT
05-08-2009, 03:20 AM
lower is better for distance..meaning the "walkers" at the bus stops will hear you from farther..heh

All though lower frequencies travel further, a higher intensity (in terms of decibels) are achieved tuning the box higher.
Just an FYI.

No offense, but might want to throw up the numbers, just in case.

luv2shrOOm
05-08-2009, 03:48 AM

05-08-2009, 03:58 AM
looks to be about 7.5cuft without port or sub displacement. Need port area to make any real determinations.
sqin = length
70 = 16.2
80 = 20.3"
90 = 25.8"
100 = 36"
110 = 839"
(all including .5" mdf as port walls ex:100=2.5cuft displacment)
longer = lower tuning from listed. All at ~35hz

Different bracing (less material) will result in a lower tuning with the same length

I cant give very accurate numbers until you give me port dimensions and how it will be built (such as using the wall of the box as part of the port)

jackson12375
05-08-2009, 05:04 AM
so what is going to be the Port H=?
W=?
L=?