Enclosure Design & Construction Help Post and discuss your car audio box construction, design, fiberglass and other fabrication questions here.

How Do I Figure Out A Approximate Port Length

Old 05-19-2011, 07:57 PM
  #1  
50 Watt CAFz'r
Thread Starter
 
Join Date: May 2010
Posts: 189
How Do I Figure Out A Approximate Port Length

I am building a box for 2 12's in a ported enclosure. I am think about building the box with these specs, and I am curious if the port i have planned out will put me in about the 45hz range.


The box dimensions would be 33w x 14h x 14d , the total cubic feet per sub would come to 1.87. The port i was thinking of sticking in this box is a slot port and i wanna make it 6w x 14h x 18d.

Basically what i need to know is if i am aiming in about the right area for port size to hit aprox 45hz area.
bjohnstone23 is offline  
Old 05-19-2011, 11:45 PM
  #2  
Level 3 Supporter
iTrader: (1)
 
Join Date: May 2000
Posts: 716
use the RE BOX calculator.
it will get you into the ball park
stephenfleming is offline  
Old 05-21-2011, 01:59 AM
  #3  
0 Watt CAFz'r
 
Join Date: Sep 2009
Posts: 12
Originally Posted by bjohnstone23 View Post
I am building a box for 2 12's in a ported enclosure. I am think about building the box with these specs, and I am curious if the port i have planned out will put me in about the 45hz range.


The box dimensions would be 33w x 14h x 14d , the total cubic feet per sub would come to 1.87. The port i was thinking of sticking in this box is a slot port and i wanna make it 6w x 14h x 18d.

Basically what i need to know is if i am aiming in about the right area for port size to hit aprox 45hz area.
Are these inside or outside specs?Because you have a 14h and you want your port to be 14h( you need to take in account the wood thickness). Did you take into count the the displacement of the sub?And if these are inside specs,are you looking to tune at 45hz or peak at 45 hz,Because if you are tuning to 45 ,your port length is going to be about 33 inches long, not 18.And if you wanna peak at 45,then its gonna be wayyyyyyyy longer ,probably in the 50's as far as length.And if you use 18 as length you will be tuned to 57hz.
keith91crx is offline  
Old 05-21-2011, 03:00 AM
  #4  
Level 3 Supporter
iTrader: (17)
 
Father Yuli's Avatar
 
Join Date: Oct 2000
Posts: 11,606
use a port calculator. there is a number of those online.
Father Yuli is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Skurred
Install related
3
07-23-2013 10:30 PM
basstoy
Enclosure Design & Construction Help
32
05-12-2012 08:15 PM
n0catchyname
Enclosure Design & Construction Help
9
03-22-2011 03:06 PM
ruhbuhzuh
Install related
6
10-15-2003 09:34 AM
ruhbuhzuh
Install related
1
10-08-2003 11:52 PM


Thread Tools
Search this Thread
Quick Reply: How Do I Figure Out A Approximate Port Length


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.