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jzagaja
12-22-2009, 07:17 AM
Does anyone know JBL lens calculator or detailed drawing?

http://www.jbl43.net/img/lenses1.jpg

grumpy
12-22-2009, 08:18 AM
what?

I think I posted a printable/scale "plan" some time ago...

Ah, here:
http://audioheritage.org/vbulletin/showpost.php?p=186755&postcount=63

The Kenrick units were nice enough for me not to bother with DIY 2308's
further.

jzagaja
12-22-2009, 10:24 AM
Thanks! Maybe some relevant patents?

Mr. Widget
12-22-2009, 11:18 AM
Thanks! Maybe some relevant patents?I believe Western Electric/Bell Labs did the initial work back in 1949.


Widget

Hoerninger
12-22-2009, 11:43 AM
Here you can find a compilation of some literature:
http://audioheritage.org/vbulletin/showpost.php?p=15434&postcount=6
Your shown lens is a path length delay element. It is calculated similar to lenses in optics (geometrical optics).
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Peter