I'm hoping someone can provide me with the correct measurements for the L-91 lenses. The 2308 lens measurments would work also. I need the flat dimensions. Thanks
I'm hoping someone can provide me with the correct measurements for the L-91 lenses. The 2308 lens measurments would work also. I need the flat dimensions. Thanks
Look here. See if that helps you
Rob
http://www.lansingheritage.org/image...lens/page2.jpg
anyone have the center curve dimensions of the 2395 slant plate handy? and what is the spacing distance between the plates?
thanks!
Can't help with the 2395 center curve, i do only have a theoretical artilcle about lenses in general.
The distance has only to be small compared to the shortest wavelength *) (highest frequency), the material should be as thin as possible without loosing stability and without making any noise.
best regards
Peter
*)
Tipp: About one tenth of the wavelength.
Last edited by Hoerninger; 07-16-2007 at 12:21 PM. Reason: Tipp
Thanks!
it seems i have read a mention of a lens horn system that was able to go out to 15KHz...
must have been a spacing of the lenses issue...
I need to do some reading into the subject
(i already found the other thread with some design papers referenced)
here...
http://db.audioasylum.com/cgi/m.mpl?...+plate&session=
now to figure out how to use the mathOriginally Posted by from AA thread
and I thought that the JBL lenses had a "better" horizontal dispertion ~140 degrees
2395 IS spec'd at 140°, but that's in trouble by 10 kHz.
The vertical beamwidth is only 10° at that frequency, and just 20° an octave lower....
http://www.lansingheritage.org/image...lens/page4.jpg
It does at 1K. Figure the rule of thumb is the -6db point is your window. You can see the lobes and thing tightening up above that. If you want CD coverage you need to use a CD horn. At the highest frequencies the horn is going to control what's going on. It's still an exponential so flat on axis depends on an increasing directivity.and I thought that the JBL lenses had a "better" horizontal dispertion ~140 degrees
I would like to see them measured with a more modern driver. A 2440 drops like a rock above 10K. That's going to skew the curves as they are essentially amplitude plots. Where are you getting 10 degrees from??The vertical beamwidth is only 10° at that frequency, and just 20° an octave lower....
Rob
books on audio, who'd athunk it.....
I thought everyone was reading....
http://www.moonshine-still.com/
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