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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 18th November 2018 11:26 PM

Here are the 4" waveguides. One keeps the mouth as a golden ellipse (1:1.618) but the others I went with 1:1.67 since it I didn't want to get too small vertically.

https://i.imgur.com/paz9xAR.png
https://i.imgur.com/UXFVD52.png
https://i.imgur.com/kDdw63g.png
https://i.imgur.com/bfivnoy.png
https://i.imgur.com/ukn5pfx.png
https://i.imgur.com/kKfLoul.png
https://i.imgur.com/fAGDu9M.png
https://i.imgur.com/SFGwLYq.png

ggetzoff 19th November 2018 12:37 AM

Awesome! Will look at these results over the next few days. Keep up the good work!!!

454Casull 19th November 2018 12:39 AM

I wonder how low the SB21SDC can be crossed in the 4" waveguide before distortion kicks in too much.

augerpro 19th November 2018 01:47 AM

Quote:

Originally Posted by 454Casull (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post5605544.html#post5605544)
I wonder how low the SB21SDC can be crossed in the 4" waveguide before distortion kicks in too much.

With the low Fs and shorting ring, probably pretty low.

ggetzoff 19th November 2018 11:21 AM

Quote:

Originally Posted by augerpro (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post5605168.html#post5605168)
I don't have my old setup that was surrounded by absorption to clean up the HD sweeps, so I probably won't be doing that now. Maybe next summer when I build another monster baffle in the garage.

You could do a floor setup A-la Jeff Bagby. Easy setup and breakdown....

mbrennwa 19th November 2018 11:39 AM

Quote:

Originally Posted by augerpro (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post5605381.html#post5605381)

I am not quite sure, but is the edge of the waveguide (or the mount plate) flush with the baffle? On the photo it looks like the blue tape seems so bulge because the waveguide is not flush with the baffle. I'd expect this to cause some wiggles in the frequency response.

ggetzoff 19th November 2018 12:05 PM

Quote:

Originally Posted by mbrennwa (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post5605949.html#post5605949)
I am not quite sure, but is the edge of the waveguide (or the mount plate) flush with the baffle? On the photo it looks like the blue tape seems so bulge because the waveguide is not flush with the baffle. I'd expect this to cause some wiggles in the frequency response.

Probably little impact.im nore worried about flush mounting an elipse.

Mandroid 19th November 2018 12:47 PM

Have you done a baseline measurement with any of the stock faceplates, see just how much the smaller waveguides affect the directivity and breakup severity/freq compared to stock?

augerpro 19th November 2018 03:05 PM

Quote:

Originally Posted by mbrennwa (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post5605949.html#post5605949)
I am not quite sure, but is the edge of the waveguide (or the mount plate) flush with the baffle? On the photo it looks like the blue tape seems so bulge because the waveguide is not flush with the baffle. I'd expect this to cause some wiggles in the frequency response.

It's pretty flush, just the way the camera exposed it doesn't look like it. But, yes, that is why I always tape around tweeters. I tape around the waveguide too, just not for this picture.

next667 19th November 2018 03:46 PM

Thank you!
Personally, it's a big dissapointment to see such on axis dip in STAC. Otoh, there is so much hope for CDC.
Once again, thanks!


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