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Open source Waveguides for CNC & 3D printing!
Open source Waveguides for CNC & 3D printing!
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Old 30th January 2018, 07:44 PM   #1
augerpro is offline augerpro  United States
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Default Open source Waveguides for CNC & 3D printing!

I've been working on a waveguide project where I would develop high performance waveguides for some popular tweeters, and than share the files for anyone to print or CNC as they are able. The discussion started here: 3D printed waveguides - Techtalk Speaker Building, Audio, Video Discussion Forum for more details. The short summary is starting with the SB26ADC and a 5" waveguide, I varied flare radius, phase shields, depths, etc. I've started to find some best practices (at least with this dome/horn combo) and all future guides will have elliptical mouths, and with and without phase shields. I then skipped to 8" designs to verify those best practices scale, so anything in between should be trivial to design and still have the expected performance. Tweeters that I'm currently designing for are: SBA SB26ADC, SBA SB19ST, Satori TW29RN, and Transducer Labs N26C-A.

To get some frame of reference, here measurements of the Kef Reference 5 prototype, and Revel Concerta2 (which I suspect also uses the SB26ADC):

SwXvs5h.png

PzwiA5G.jpg

Here is my "C" waveguide with SB26ADC, with and without phase shield:

fWa3ogG.png

uFZJwwC.png

Quite good results I think, better than Revel achieved with the same tweeter! Anyway, the reason I am posting now though this project is still in its infancy, is I've connected with a couple gentleman with the ability to model waveguides. This could speed things up considerably, as waveguide design is extremely iterative otherwise because 90% of the performance happens at the dome/throat interface and this is not easily modeled.

We've started with verifying that the sim can accurately predict reality. With as close a representation as possible of the dome here are the results:

G1xLXON.png

33D7GDE.png

Extremely encouraging! I'd like to do some additional verification - particularly of the 8" guides I've started working on - and then I hope to push the sims to the max, and start producing some really excellent guides for popular tweeters.
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Old 30th January 2018, 07:49 PM   #2
augerpro is offline augerpro  United States
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BTW I should add some background on measurement conditions. I use MLS signal with a 6ms gate to remove the first reflections. Measurements were at 1.5m or so, with a calibrated mic. The baffle was not the big baffle I used for measurements at my drivervault site, but 2'-ish by 3'-ish rectangle with the driver offset. Sim showed quite smooth response to about 1khz, but I suspect diffraction is starting to creep into the measurements <4khz and are significant closer to 1khz. Angles are 0-60 in 10 degree increments.
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Last edited by augerpro; 30th January 2018 at 08:11 PM.
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Old 30th January 2018, 07:54 PM   #3
augerpro is offline augerpro  United States
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Some examples (the mouths are round to facilitate easy mounting on my baffle with just a circle cutout, actual print files are elliptical flanges):
Attached Images
File Type: jpg UkLqBHL.jpg (110.2 KB, 684 views)
File Type: jpg KbhkNXG.jpg (76.8 KB, 661 views)
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Last edited by augerpro; 30th January 2018 at 07:57 PM.
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Old 30th January 2018, 08:03 PM   #4
mlee is offline mlee  Canada
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Fantastic work! Those guides look great too, are they 3D printed? This is a great concept, subscribed even though I doubt I have anything to contribute. I do have access to a 3D printer so maybe I could do some testing if required. Best of luck!
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Old 30th January 2018, 08:10 PM   #5
augerpro is offline augerpro  United States
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Yes they are printed via laser-sintered nylon. Resolution is excellent and the strength is fantastic. Hard to photo though.
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Old 31st January 2018, 10:45 AM   #6
Rokytheman is offline Rokytheman  Denmark
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Very interesting. Keep us opdated :-)

Would really like to try a waveguide with one of the SB tweeters.
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Old 31st January 2018, 11:57 AM   #7
S4m is offline S4m  Germany
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Wow! As Roky said, very interesting
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Old 31st January 2018, 12:21 PM   #8
fatmarley is offline fatmarley  England
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Cool project and very kind of you to share the files.
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Old 31st January 2018, 12:55 PM   #9
jcarr is offline jcarr  United States
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Kudos for a project that could be very useful for many!
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Old 31st January 2018, 04:21 PM   #10
Zonneschimmel is offline Zonneschimmel  Belgium
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Subscribed. I have a pair of 26ADC and Satori TW29RN and some friends with 3D printers :-).

Not sure if possible but I would be very interested in (and even pondered trying to sim it myself) a Seas DXT type waveguide.
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