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-   -   Open source Waveguides for CNC & 3D printing! (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing.html)

augerpro 13th January 2020 09:35 PM

BTW I also have a couple designs for the Bleisma T25B on tap. The throat is very small so i'm hopeful we can get at least SB26ADC-level results, and hopefully even a bit better in the top octave.

augerpro 13th January 2020 09:37 PM

2nd BTW: I have a couple variants for the typical Scanspeak tweeter. If someone would send me a tweeter to use, I'll send those designs to the printer also. Two would be similar to the one mbrennwa is using, and a third is large, 6.5" I think.

Jeroen Mantel 13th January 2020 09:48 PM

Yes, that Bliesma T25 has an inverted surround, so maybe you can overlap it a bit with the throat, to get a smaller diameter.

Jeroen

Arnandsway 13th January 2020 10:46 PM

Much worse without a WG... Because it's very much wider in despersion.


https://imgur.com/gallery/miahJ42
SB 26ADC traced from manufacturer, simulation Without WG - Album on Imgur

Arnandsway 13th January 2020 10:50 PM

Quote:

Originally Posted by augerpro (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post6043365.html#post6043365)
Interesting. I have a 6.5" on tap for the SB26 for those lower crossover frequencies. Maybe you could trace the factory SB26ADC curves and see what improvement you already have over that?


If you can show me these measurements for the 6,5" I can trace them again and see the difference. :)
See my reply above for the tweeter without WG

Bear5k 13th January 2020 11:06 PM

Quote:

Originally Posted by augerpro (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post6043368.html#post6043368)
BTW I also have a couple designs for the Bleisma T25B on tap. The throat is very small so i'm hopeful we can get at least SB26ADC-level results, and hopefully even a bit better in the top octave.

Do you have to remove the grill, or does that remain fixed in place? I'm very curious about these drivers.

Also, I've got a pair of SS6600s that I could loan you for testing. Feel free to PM.

augerpro 13th January 2020 11:06 PM

Quote:

Originally Posted by Arnandsway (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post6043423.html#post6043423)
If you can show me these measurements for the 6,5" I can trace them again and see the difference. :)
See my reply above for the tweeter without WG

I still have to get it printed. Probably gonna be a couple months. Still I like your results. One design criteria for the 5" waveguides was that they would have similar dispersion to a 12-15cm woofer at 2.5khz. That frequency would be ideal for the crossover, but I did wonder how much room there was to go lower in the real world. Your results show we can go lower, though your crossover is probably a bit low if we are going for perfectly smooth directivity (according to your sim anyway). Revel uses a similar low crossover on the M105 and that is the same tweeter, similarish waveguide, and 15cm woofer, and their results are pretty good.

augerpro 13th January 2020 11:10 PM

Quote:

Originally Posted by Bear5k (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post6043433.html#post6043433)
Do you have to remove the grill, or does that remain fixed in place? I'm very curious about these drivers.

Also, I've got a pair of SS6600s that I could loan you for testing. Feel free to PM.

Yes grill removed. It's pretty easy to do, I think ergo over at htguide did a walkthrough with the T34.

I'll PM you when I get a better idea when I'll have the waveguides printed.

Arnandsway 13th January 2020 11:27 PM

Quote:

Originally Posted by augerpro (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post6043435.html#post6043435)
I still have to get it printed. Probably gonna be a couple months. Still I like your results. One design criteria for the 5" waveguides was that they would have similar dispersion to a 12-15cm woofer at 2.5khz. That frequency would be ideal for the crossover, but I did wonder how much room there was to go lower in the real world. Your results show we can go lower, though your crossover is probably a bit low if we are going for perfectly smooth directivity (according to your sim anyway). Revel uses a similar low crossover on the M105 and that is the same tweeter, similarish waveguide, and 15cm woofer, and their results are pretty good.

Okay then! For my project I have actually printed the 6 inch version, so it will be a bit better I hope. But my baffle will be ready in a few months as well, so it's nice to be able to simulatie it beeforehand.


Maybe in the meantime I will design a mtm with 5 inchers, using Horbach Keele crossovers. See where that leads me...

Arnandsway 13th January 2020 11:30 PM

How is your website coming along? I can't see much of it yet.


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