enclosure port - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 24th January 2004, 08:29 AM   #1
sma is offline sma  Indonesia
diyAudio Member
Join Date: Dec 2003
Location: jakarta
Default enclosure port

anyone can help for port specification?.I want to build subwoofer enclosure the enclosure spec is 2.50 cu ft volume,port is 25sq inch X 15" Lenght....I don't understand about 25 sq",how i can convert that to normally round diameter inch?
  Reply With Quote
Old 24th January 2004, 08:33 AM   #2
diyAudio Member
Join Date: Mar 2003
Location: brisbane queensland
you can see if this helps

  Reply With Quote
Old 24th January 2004, 08:41 AM   #3
sma is offline sma  Indonesia
diyAudio Member
Join Date: Dec 2003
Location: jakarta
thank you,

i already try but i don't understand use this conversion.i input data,but the calculator can't process...i don't know what the mistake.

is the sq inch port mean not rounded ?
  Reply With Quote
Old 24th January 2004, 11:49 AM   #4
diyAudio Member
Join Date: Mar 2003
Location: brisbane queensland
To use that calculator you need to know what freq the port will tune your box to .
what dia tube is available to you to use such as plumbing pipe 3" or 4" plug them in & it will give you a length
  Reply With Quote
Old 24th January 2004, 04:47 PM   #5
Ron E is offline Ron E  United States
diyAudio Member
Ron E's Avatar
Join Date: Jun 2002
Location: USA, MN
square inch is a measurement of area
a circle with an area of 25 square inches is :
For your area of 25 square inches, the diameter is 5.64 inches, or 14.3 cm.

It is hard to make a round port a specific size, so you can scale your length, based on available port diameters.
L1/L2=A1/A2, where L1, A1 are the original length and area, and L2,A2 are the new length and area...
rearranging again, and Realizing that area is proportional to diameter squared, and entering your port data:

You input the diameter of the ports you can get, and from that you can get the new length.....
Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan
Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. Aldous Huxley
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Labrinth type port in bottom of enclosure ? quickshift Subwoofers 10 9th September 2007 06:57 PM
Bass Reflex Enclosure & Port Tuning D_GR8_1 Multi-Way 2 2nd December 2004 09:11 PM
Adding a Port to my enclosure Maples Multi-Way 6 26th July 2004 06:29 AM
First project - enclosure & port size tibor Multi-Way 4 12th February 2003 10:46 PM
how far away from the enclosure wall should my port be? slicemaster101 Subwoofers 1 15th April 2002 09:35 AM

New To Site? Need Help?

All times are GMT. The time now is 11:47 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2