Two Ports, different frequencies?

Home / the12volt's Install Bay / Car Audio / Two Ports, different frequencies? (

Topic Closed)

Welcome Guest :)

Members

Search

Register

Login

< Prev Topic Next Topic >

Poormanq45

Silver - Posts: 597

Joined: October 27, 2004

Location: United States

Posted: April 26, 2005 at 1:25 PM / IP Logged

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?

Back to Top

DYohn

Moderator - Posts: 10,741

This member has made a donation to the12volt.com. Click here for more info.

This member has been recognized as an authority in Electrical Theory. Click here for more info.

This member has been recognized as an authority in Mobile Audio and Video. Click here for more info.

Joined: April 22, 2003

Location: Arizona, United States

Posted: April 26, 2005 at 1:35 PM / IP Logged

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." Two Ports, different frequencies? -- posted image.

Two Ports, different frequencies? -- posted image.

Support the12volt.com

Back to Top

Poormanq45

Silver - Posts: 597

Joined: October 27, 2004

Location: United States

Posted: April 26, 2005 at 1:46 PM / IP Logged

Thank you for the easy answer. Can you link me to that website you mentioned please?

Is what occurs similar to a "beat"?

Back to Top

DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: April 26, 2005 at 2:05 PM / IP Logged

I don't know what you mean by "beat." Herre are a couple of good resources:

http://www.jlaudio.com/tutorials/ports/

http://www.phys.unsw.edu.au/~jw/Helmholtz.html

http://www.textfiles.com/fun/q&a

Support the12volt.com

Back to Top

Poormanq45

Silver - Posts: 597

Joined: October 27, 2004

Location: United States

Posted: April 26, 2005 at 2:34 PM / IP Logged

I mean beat, as in the summation of to different frequencies is what is heard, not the individual frequencies.

Back to Top

DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: April 26, 2005 at 3:00 PM / IP Logged

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

Back to Top

Masta N

Member - Posts: 47

Joined: March 15, 2002

Location: United States

Posted: April 26, 2005 at 3:38 PM / IP Logged

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.

Back to Top

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

Printable version

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

Search the12volt.com

Follow the12volt.com

Disclaimer: *All information on this site ( the12volt.com ) 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.

Two Ports, different frequencies?

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

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