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Old 19th December 2006, 02:23 AM   #11
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Location: SiliconValley
Originally posted by jzagaja
Do you know how thick the 300 ppi PUR foam is used in Geddes Summa Cum Laude?

As the soundwave is reflected at the mouth, and then again at the throat, it will travel through the foam a minimum of THREE times. From the absorption table below, 0.5"**3 would provide almost complete absorption down to 400-500Hz. So, experimenting with 0.25" and 0.5" 30 pores-per-inch foam would seem to cover midrange-tweeter range.

30 ppi polyurethane foam...1.00 = 100% absorption
......frequency...........125.....250......500.... ..1000......2000......4000
Foam:.polyur.. 1"_____0.13___0.22___0.68____ 1.0___0.92___ 0.97
Foam:.polyur.. 1/2"___0.09___0.11___0.22____0.60___0.88____0.94

I do not have enough experience with waveguides to give advice on using a JORDAN JXR6 HD. I would probably look at a 2" compression driver first.

It seems that there are few front loaded Jordan horns.
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Old 19th December 2006, 06:42 AM   #12
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Why not just buy one, Peerless have a horn loaded version of their classic tweeter. 99 db @ 1 meter/ 1 watt.
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Old 19th December 2006, 07:51 AM   #13
tubee is offline tubee  Netherlands
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Here's a (german) firm who makes horns from artificial stone:

Daisy Bell
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