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csu87
07-19-2009, 12:37 AM
For a T shaped port in the middle of the box, do you go the full length or do you split it in half for the "T" part?


If my total length is to be 24" and i can get 19" before the split, do i go 5" to each side or 2.5" to each side?

also, is the top of the "T" the same width as the front?

5" width opening so is the back port 2.5" or 5"?


Thanks

Louisiana_CRX
07-19-2009, 12:39 AM
:confused:

csu87
07-19-2009, 12:46 AM
heres a pic of the problem

front of box is at the top and back of box at the bottom

http://img268.imageshack.us/img268/2712/tport.jpg

those are ? not sevens for the dimensions

DNick454
07-19-2009, 12:50 AM
Where the split occurs, the port should be half as wide, but should still travel the full distance. Let's say you have a port that's 4" wide and need 24". If it goes 19", the port length needs to then drop to 2" wide and still go 5" in both directions so EACH port has a total length of 24", not combined.

csu87
07-19-2009, 12:53 AM
ok thanks

killa101
07-19-2009, 03:00 AM
That is not a correct port design. In order for it to be correct you would need to have a divider down the middle splitting it to two seperate chambers/ports.

Here is a link...
http://www.the12volt.com/installbay/forum_posts.asp?TID=99886&KW=port+killa

TheyDontWant
07-19-2009, 03:22 AM
That is not a correct port design. In order for it to be correct you would need to have a divider down the middle splitting it to two seperate chambers/ports.

Here is a link...
http://www.the12volt.com/installbay/forum_posts.asp?TID=99886&KW=port+killa

its perfectly fine without a divider.

SSS 18734
07-19-2009, 04:05 AM
its perfectly fine without a divider.

It will work that way, but it's kind of half assed. A divider isn't hard to put in and will help reduce turbulence in the port.

killa101
07-19-2009, 04:11 AM
It will work, but I wouldn't do it that way. I would either split it up to two seperate ports or put it off to the side like in the image below...

http://www.the12volt.com/installbay/uploads/69F_image2.jpg

tc3k101
07-19-2009, 04:15 AM
heres a pic of the problem

front of box is at the top and back of box at the bottom

http://img268.imageshack.us/img268/2712/tport.jpg

those are ? not sevens for the dimensions

thats a jl as in jl audio port.

killa101
07-21-2009, 01:53 AM
thats a jl as in jl audio port.

Well I e-mailed that exact design to JL tech support...


Can you let me know if this is an acceptable design. When I mean an acceptable design I mean the way the port is designed not the actual specs. Thanks!
http://img268.imageshack.us/img268/2712/tport.jpg


No, you have different resonant frequencies in each of the port sections, you are much better off keeping the ports individual (and the same cross-sectional area) all the way to the front.

mmouse57
07-21-2009, 10:03 AM
you DO NOT NEED A DIVIDER
and it ISNT A HALF ASSES DESIGN WITHOUT ONE

just as the above guy said use 2 ports that branch of the main port that are 1/2 the width

so if 20in long x 4in x10in w/h
and back of box is 12in you would branch off 8x10x2in x2

its really easy and you will not get turbulance or port noise this way as its exctly the same as a divider in the middle as the other guy said

i used to work for jl mirimar so no ned to ask them if its ok im telling you as are others here :)

gl