Frequency vs. angle

Olombo · 9th August 2012, 06:53 PM

Hello!

For my new loudspeaker project I would like to do some calculation or simulation and have a specific question:

If I have a given diameter of my speaker membrane and give different frequencies on the speaker, then the opening angle of the "sound beam" is smaller the higher the frequency is. Ok this I know.

But how could I calculate how big this angle is for different drivers for different frequencies? Especially if a horn comes inside this game? I tried some simulations with abaqus but unfortunately something seems to be wrong with it and nobody in our company can help as we usually need it NOT for acoustic simulations ;-)

Reason is I want to build a coax speaker and want to adopt the HF horn correctly to the woofer. I do not care about delay between both as this I can correct with electronic but I would like to get close to a point source...for this same opening angle at the crossover seems important for me.

cheers!

rcw666 · 9th August 2012, 10:04 PM

There is also software called axidriver that is a free download suitable for this.
For back of the envelope calculations, (116*lambda)/d, is good enough because the actual directivity above the piston range depends upon cone profile.
rcw

geraldfryjr · 10th August 2012, 06:29 AM

Thank you for the tip !!!
I have searched high and low for a program that does what this one does !!!

http://www.randteam.de/RDTeam/Products.html

Download - AxiDriver-Demo

To bad it is a demo but I can deal with not being able to save my projects.

Thanks Again !!!

jer

Olombo · 10th August 2012, 10:14 AM

Hi,

thanks will check this out on the weekend...hopefully it does what I want ;-)

9th August 2012, 06:53 PM	#1
Olombo diyAudio Member Join Date: Jul 2012	Frequency vs. angle Hello! For my new loudspeaker project I would like to do some calculation or simulation and have a specific question: If I have a given diameter of my speaker membrane and give different frequencies on the speaker, then the opening angle of the "sound beam" is smaller the higher the frequency is. Ok this I know. But how could I calculate how big this angle is for different drivers for different frequencies? Especially if a horn comes inside this game? I tried some simulations with abaqus but unfortunately something seems to be wrong with it and nobody in our company can help as we usually need it NOT for acoustic simulations ;-) Reason is I want to build a coax speaker and want to adopt the HF horn correctly to the woofer. I do not care about delay between both as this I can correct with electronic but I would like to get close to a point source...for this same opening angle at the crossover seems important for me. cheers!

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9th August 2012, 10:04 PM	#2
rcw666 diyAudio Member Join Date: Aug 2012	There is also software called axidriver that is a free download suitable for this. For back of the envelope calculations, (116*lambda)/d, is good enough because the actual directivity above the piston range depends upon cone profile. rcw

10th August 2012, 06:29 AM	#3
geraldfryjr diyAudio Member Join Date: Feb 2008 Location: Jackson,michigan	Thank you for the tip !!! I have searched high and low for a program that does what this one does !!! http://www.randteam.de/RDTeam/Products.html Download - AxiDriver-Demo To bad it is a demo but I can deal with not being able to save my projects. Thanks Again !!! jer

10th August 2012, 10:14 AM	#4
Olombo diyAudio Member Join Date: Jul 2012	Hi, thanks will check this out on the weekend...hopefully it does what I want ;-)