2397 Diffraction Horn

anyone built any of these?

www.jblpro.com/pub/obsolete/2397.pdf


i know they are old but looks promising for a compresion driver array

The 2397 was JBL's 'smith horn'.

I have built one or two for monitors (god knows what happened to them).

A smiths horn is a horn based on this article:
img285.imageshack.us/img285/8025/dsh14so.jpg
img285.imageshack.us/img285/3042/dsh20mo.jpg
img527.imageshack.us/img527/5312/dsh39wv.jpg

A LA waveguide has a slightly different approach. The 'slot' is vertical.

The original is unsuitable for array use as it just has way too much dispersion in both planes.

I made a drawing which I posted for you which roughly tries to show how most LA waveguides look (only I scaled it up for your mids). You can spot the similarities.