spacer spacer spacer spacer

port size, 2 kicker cvr12's

Post ReplyPost New Topic
< Prev Topic Next Topic >
jaime zeledon 
Member - Posts: 24
Member spacespace
Joined: December 22, 2006
Location: United States
Posted: November 23, 2007 at 6:04 PM / IP Logged  
Im building my frist box for 2 kicker cvr12's. The box will be 40" wide 14" depth and 14" in height it will be tuned to 34hz what dimensions should the square port have?
big sexy lac 
Copper - Posts: 153
Copper spacespace
Joined: November 01, 2007
Location: Illinois, United States
Posted: November 23, 2007 at 7:50 PM / IP Logged  
Are they gonna share or have seperate chambers?
Platinum - Posts: 5,816
Platinum spaceThis member has made a donation to Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member consistently provides reliable informationspace
Joined: January 24, 2004
Location: Pennsylvania, United States
Posted: November 23, 2007 at 8:09 PM / IP Logged  

You've been around this forum for awhile, so you know about the box volume and port calculator apps found over to the left side....

1.  Find the cubic feet volume of the chamber you wish to vent.  Use the box volume calc.

2.  Decide on square inches of port opening you want to use for your situation.  Then use the port length calc.  For purposes of using this particular calculator which asks for (round) port diameter, you can use the following as a guide:

4" Diameter port is 12.56 sq in.

5" D is 19.6 sq in.
6" D is 28.26 sq in.
7" D is 38.47 sq in.
8" D is 50.24 sq in.

3. Divide the square inch opening space by the longest side of the port that you would like to use (or are limited to), and the answer will be the other dimension of the opening.  Example:  28.25 sq in opening space / 12" (example of a limitation of inside box height) = 2.35".  Which is to say, a vent opening that is 12" X 2.35" = 28.25 square inches.

For your two subs at rated power input (and with regard to box volume and Fb), the port opening should be no less than 28 sq in, and preferably in the area of 35 to 40 sq in.  If the opening is too small there will be port noise interference.

For double-checking your work, here's one calculator you can also try:

You should be aware, though, that CompVR's will perform best in large sealed boxes, not vented.  Re:

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

Sorry, you can NOT post a reply.
This topic is closed.

  Printable version Printable version Post ReplyPost New Topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Follow Follow on Facebook
Monday, September 26, 2022 • Copyright © 1999-2022, All Rights Reserved Privacy Policy & Use of Cookies
Disclaimer: *All information on this site ( ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

Secured by Sectigo spacer spacer spacer
Top spacer spacer