T25A Simple Waveguide Profile

Just arrived:

WG1.jpg


WG2.jpg


WG3.jpg


Next is sanding/smoothing & black painting...
 
One small thing to mention is that it is not good to have the surround come into direct contact with the waveguide. As the surround on the Bliesma drivers is glued to the front plate I print a thin spacer (Donut Ring)of 0.2 to 0.3mm that fits around the outside of the glued surround to stop any pressure being applied.

With my T34A waveguide not using the spacer caused a 4K resonance that went away when the spacer was used.

The same thing can be made from thin card or a couple of layers of tape.
 
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I can offer STEP and STL files of the shown WG with the shape as designed by fulid.

Beware:
I've made incoming inspection with a caliper and also measured the T25A and put it roughly, it should fit. Gaps are pretty close; otherwise, no further integration check or measurements were done till now.
M3 threads for the back bracket mounting screws are foreseen to be directly drilled into the body, holes have 2,5mm dia therefore. The print was planned to be from PA12 Nylon that is hopefully solid and strong enough to do so; with softer materials this concept might not work.
 

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Can someone please, make the holes disappear?
I used tinker cad, I rotated a mirror waveguide and combine them together, but it left a me artifact which are deep enough to sand them away.
The reason doing so, is that I need to use the waveguide at an already 12cm hole!
 

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