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View Full Version : Ok, Once more, double check my port length



qtipextra
01-29-2009, 12:54 AM
http://img156.imageshack.us/img156/5443/boxzq2.jpg

Effective port length = 25", right?

Total length, down the center is 28.5. Take away half of the port width (3.5") for end correction, and that gives me an even 25" of effective port length.

Did I get it correct?

Immacomputer
01-29-2009, 11:01 AM
Nope. Your effective port length is:

19+3+3+3.5+3.5 = 32"

End correction gets added, not subtracted.

qtipextra
01-29-2009, 08:37 PM
Oh, OK. Let me try this again:

http://img177.imageshack.us/img177/1274/boxbs8.jpg

I shortened up the port so it doesn't go clear to the end of the box.

So now, I get 14 + 3 + 3 + 1 + 3.5 (end correction) = 24.5". 24.5" Is close enough for me.
I sure hope I got it this time.

Immacomputer
01-29-2009, 10:51 PM
That's correct, but I don't like the look of the positioning.

qtipextra
01-30-2009, 12:03 AM
Yeah I dont especially like that either but I dont know how else to do it. It shouldn't matter though, should it?

qtipextra
01-30-2009, 06:40 PM
Is end correction figured in no matter what, even without a 90* bend?

And I was also wondering:

I am using Bass Box Pro. So when I have it figured that my port should be 24.5" long, is it figuring end correction? Or does it matter? I guess what I mean is, does my effective port length drawn agree with BBP's port length?

qtipextra
02-01-2009, 10:36 PM
Is end correction figured in no matter what, even without a 90* bend?

And I was also wondering:

I am using Bass Box Pro. So when I have it figured that my port should be 24.5" long, is it figuring end correction? Or does it matter? I guess what I mean is, does my effective port length drawn agree with BBP's port length?

???

germandark
02-02-2009, 12:00 AM
there is trapped air. get rid of all that gunk, make the single port wall longer and then throw one 45 in the corner.

qtipextra
02-02-2009, 12:54 AM
there is trapped air. get rid of all that gunk, make the single port wall longer and then throw one 45 in the corner.

I'd love to take it all the way to the wall and have one 45, but then it screws with the length.

Refer to the thread too:

http://www.caraudio.com/forum/showthread.php?t=378749