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Old 9th February 2003, 08:51 PM   #1
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Default How to model a closed box speaker??

Hi I'm an EE student, and have chosen to study speakers as a theme during this semester.

The problem is that the school I'm attending don't have any teachers with experience in speaker design, and I therfor turn to you guys and girls.

I would like to model a closed box, but I only have a model (with resistors coils transformers etc.) I don't have the values for these components. I'd really like to calculate the model, eventhou it's been done before, but I'm not sure where to start.

I would like to compare my own results with those found using the Thiele Small model parameters.

If anybody know anything or have papers from AES, I would love to see them, as I'm starting from scratch.

Ohh yes and it's only the low freq model I'm working on (to start with)

Thanks in advance

\Jens
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Old 9th February 2003, 10:53 PM   #2
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This is a good start.

Art has a very rigorous box model.


http://www.silcom.com/~aludwig/contents.htm

Russ
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Old 9th February 2003, 10:58 PM   #3
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I have the Journal of The Audio Engineering Society Loudspeaker Anthology Parts I and part of Part II.

I can post the circuit here and Email the article to you. It will be done today or tomorrow.

I am thinking of an article by Small. I believe there might also be an article by Bart Locanthi.

If I haven't given you the Email or posted on this thread by tomorrow, "bump" this to the top of the list by requesting again.
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Old 11th February 2003, 10:46 AM   #4
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Default Bumping

Hey kelticwizard

I "bumped" it

\Jens
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Old 11th February 2003, 05:37 PM   #5
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You need to get a copy of Beranek's (sp?) book on the subject. It goes heavily into the electrical modeling of speaker systems. It would be an invaluable resource.

I'll see if i can dig my copy out of the library and get a proper title, ISBN etc. (it is mentioned i believe in another thread if you want to try to search it out)

dave
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Old 12th February 2003, 02:37 PM   #6
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Jens, the two books you need are:
Introduction to Electroacoustics and Audio Amplifier Design, second edition by W. Marshall Leach Jr.
ISBN 0-7872-6093-2

and
Theory and Design of Loudspeaker Enclosures
J.E. Benson,
ISBN 0-7906-1093-0

Andrew
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Old 12th February 2003, 02:47 PM   #7
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Default Books

Thanks to Dave and Andrew

\Jens
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Old 12th February 2003, 02:55 PM   #8
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Also worth a look is :

Introduction to Electroacoustics and Audio Amplifier Design
W Marshall Leach Jr
ISBN 0-7872-7861-0

It's got some really thorough mathematical/electrical analysis in it as well as good background material. The man is a bit of a legend and much underrated imho.
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Old 12th February 2003, 02:58 PM   #9
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....ooops, read the thread too fast and didn't see it had already been mentioned. spot the idiot.......

also worth mentioning that i've always found the box design stuff in Beranek to be a bit brief in places and definitely not as good as that in Marshall Leach Jr.
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Old 12th February 2003, 06:16 PM   #10
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My sincere apologies. I am having trouble with this damn scanner. It was bought less than a year ago.

Everything is fine on it except that there is a thin line down the middle that looks like somebody ran down it with an eraser.

By going greyscale, I can eliminate most of it and make it readable. But it is a struggle. I have spent some time on this.

My original intention was to send you two articles by Small
A) Modeling a loudspeaker unenclosed-to acquaint you with the terminilogy-and
B) Modeling a loudspeaker in a closed box.

I was also going to include Bart Locanthi's earlier and shorter article, which also modeled in a closed box and served as the basis for Small.

All three articles are from the Journal of the Audio Engineering Society.

If I cannot get you Small's article due to technical difficulties, I will try to get you Locanthi's shorter article.

Sorry.
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