Two Ports, different frequencies?
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=54666
Printed Date: July 05, 2025 at 2:57 AM
Topic: Two Ports, different frequencies?
Posted By: Poormanq45
Subject: Two Ports, different frequencies?
Date Posted: April 26, 2005 at 1:25 PM
Is it possible to have two ports in a single enclosure with each port tuned to a different frequency?
If so what would be the result?
-------------
Replies:
Posted By: DYohn
Date Posted: April 26, 2005 at 1:35 PM
Multiple ports in an enclosure will function together to "tune" to one fundamental frequency. You cannot create two helmholtz resonators in one chamber. The formula is rather complex and if you want to know how multiple ports will work together I can direct you to a web site, but the easy answer to your question is "No, it doesn't work like that."  ------------- Support the12volt.com
Posted By: Poormanq45
Date Posted: April 26, 2005 at 1:46 PM
Thank you for the easy answer. Can you link me to that website you mentioned please?
Is what occurs similar to a "beat"?
-------------
Posted By: DYohn
Date Posted: April 26, 2005 at 2:05 PM
Posted By: Poormanq45
Date Posted: April 26, 2005 at 2:34 PM
I mean beat, as in the summation of to different frequencies is what is heard, not the individual frequencies.
-------------
Posted By: DYohn
Date Posted: April 26, 2005 at 3:00 PM
Poormanq45 wrote:
I mean beat, as in the summation of to different frequencies is what is heard, not the individual frequencies.
Hmm, not familiar with the use of the word "beat" in that fashion. A summation of frequencies would, in my world, be called a "sound" or a "tone" or a "chord." Multiple ports in one enclosure will create a single tuning frequency determined by their combined physical properties and it will be different from what either port would create by itself. The sound coming from both ports will be the same. ------------- Support the12volt.com
Posted By: Masta N
Date Posted: April 26, 2005 at 3:38 PM
If you wanted to be able to tune an enclosure to multiple frequencies, you could use and collapesable(sp) port with some sort of actuator driving it. It would be a real trick to get it right but would allow for multiple tuning frequencies in one encloseure. Alternativly, you could just run a plug in the port and switch between sealed and ported.
|