Isodynamic tweeter waveguide design choice

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I've designed and printed a bazillion waveguides, and I've generally found that oblate spheroidal produces the best polar response.

Here's how I make mine: http://www.diyaudio.com/forums/multi-way/279476-3d-modeling-tips-tricks.html

Thanks for your answer and your tips and tricks... my first quotation for a 3D printing service is :eek: amazing
... because 3D printing is too expensive, a small WG of 8' diameter and 2' of deepness cost 200$... for a basic plastic finish with +-0.5mm of precision.
I wait for a honorable and respectable democratic offer.
 
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