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View Full Version : Detailed information about JBL HL88?!


Bobby_Ellwing
12-12-2007, 01:44 AM
Hi@all,

I am looking for scientific information about the working principle of the shown acoustical lens HL88 (Aufnahme 1 and Aufnahme 2) from JBL for my diploma thesis. Of course I know about acoustical lenses in general how they work and so on, but what I am looking for is about mathematical expressions, simulation tools for mathematica or anything else where I can figure out the connection between plate thickness, hole size, hole shape, number of plates,... So if you have some engineering stuff about this in your archives, please let me know and post it. Thank you very much for your help.
Bye from Germany.
Gerald (www.dbaudio.com)
Hofmannhp
12-12-2007, 03:10 AM
Hi Gerald,

Welcome to the forum.
I think to know what you need.....take a look for mathematics for microwave technologies and mathematics. They are very similar in this case though there are other wavelengths. There is a lot more material about this available......e.g. check old Rhode & Schwarz disertations. Also the similarity can be part of your diploma works. Good luck.

HP
Robh3606
12-12-2007, 08:17 AM
Welcome

Here you go. It's on the site in the Tech Library

http://www.lansingheritage.org/html/jbl/reference/technical/lens.htm

Rob:)
Bobby_Ellwing
12-13-2007, 02:49 AM
Hi,

thanks for your replys, but actually I am looking for something more detailed just like and maybe exactly in the case of this JBL lens

http://www.isvr.soton.ac.uk/STAFF/Pubs/Pubpdfs/Pub7957.pdf

or

http://www.isvr.soton.ac.uk/STAFF/Pubs/Pubpdfs/Pub9233.pdf

Bye
GLA
Robh3606
12-13-2007, 08:17 AM
Did you read it?? The reference to the original paper is in the text. You are going to have to do a search for their work.

Rob:)
Hofmannhp
12-13-2007, 11:33 AM
Did you read it?? The reference to the original paper is in the text. You are going to have to do a search for their work.
Rob:)


Hi Gerald,

Welcome to the forum.
I think to know what you need.....take a look for mathematics for microwave technologies and mathematics. They are very similar in this case though there are other wavelengths. There is a lot more material about this available......e.g. check old Rhode & Schwarz disertations. Also the similarity can be part of your diploma works. Good luck.

HP


aha....I wasn't that wrong with my guess...