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augerpro 31st January 2018 08:04 PM

Thanks everyone for the encouragement! I'll start posting some .stl or .obj files after I measure a few guides I just received from the printer. No definitive designs, but at least people can play round with them and see what they think so far.

jc2 31st January 2018 11:14 PM

Very cool work. So these just mount on top of the existing tweeter faceplate? No disassembly of the tweeter?

I have access to a CNC machine, if you want to prototype a pair in aluminum let me know, I can probably make that happen. Not sure I can make the waveguide with integrated phase plugs though. Might have to be 2 pieces, or it might just be really difficult to do in any case. If you have 3d files in .stp format it's pretty trivial for me to see how bad the CAM work would be.

augerpro 1st February 2018 01:55 AM

Mounting depends on the tweeter. For all the SBA/Satori drivers, their faceplate comes off easily and is not integral to locating the diaphragm like many tweeters are. So pretty easy to mate, and they have keyholes, so matching that in my design makes centering the dome pretty much plug-and-play. The Transducer Lab tweeters require the faceplate to stay attached or you'll rip the diaphragm off with it. Luckily there flat faceplate again makes mounting very easy.

Early on in the thread at PE, we discussed this, and it would be fairly easy to design the phase plug as a standalone item with cylindrical keys at the end, with a matching depression in the waveguide wall which would be easily made with the end mill of the CNC. I "hope" with some optimization the phase plug won't be necessary.

Ro808 1st February 2018 04:19 AM


Originally Posted by augerpro (
I "hope" with some optimization the phase plug won't be necessary.

That's the next topic on the agenda, I guess ;)

Rokytheman 1st February 2018 08:34 AM

Have you thought making/simulating a waveguide for the SB29RDC-C000-4 tweeter?

augerpro 1st February 2018 07:17 PM


Originally Posted by Rokytheman (
Have you thought making/simulating a waveguide for the SB29RDC-C000-4 tweeter?

No I haven't. Are the diaphragm dimensions the same as the TW29RN?

Gaga 1st February 2018 10:16 PM


First of all I wanted say that I'm very impressed about the work Brandon is presenting here.

Actually I'm in contact with Brandon and Ro808 and try to support this work here with respective simulations (see post #1 by Brandon).

Just some disclaimers:
- I'm probably not the most experienced person with respect to simulations around here. I started a 'how to use ABEC'-thread in a German DIY forum some time ago (see here if interested). There are some DIYs with much more experience on simulations and waveguide construction around in this German forum, who considerably contributed to the ABEC-thread. I'm still learning...
- However, I'll support Brendons great work as good as possible anyway.
- My replies my be late and some results may be communicated via Brendon and Ro808 as I have only very little time for the hobby actually...


Not sure if possible but I would be very interested in (and even pondered trying to sim it myself) a Seas DXT type waveguide.
I did quite some simulations on how the Seas DXT waveguide works here. Especially #199 to #206. May be this helps.

The linked thread is on how to construct a constant directivity waveguide. Funny enough, I ended up with elliptical waveguides as well, comparable to Brandons approach.


augerpro 2nd February 2018 11:34 AM

Thanks for the help so far Christoph! I just applied for the student license of ABEC and see how far I can get. When you get a chance PM me with your basic workflow for going from the CAD file to ABEC sim. Nothing detailed is necessary, just a high level overview.


Zonneschimmel 2nd February 2018 12:26 PM

Thanks for the link, I can read some German but it'll take some google-translate help to get all the details :-)

Gaga 2nd February 2018 12:43 PM

Hi Brandon, I'll PM you or will give the workflow here. May need some time though...

A critical step for ABEC simulations is getting a proper mesh from the *.stp file. I do this with Gmsh and described basic steps here.

Basic information on 'how to ABEC' can be found here (watch out, German) or in the extremely helpful (:D) helpful and examples provided with ABEC.

Hi Zonneschimmel, Just let me know, if something get's lost in translation :D, I'll b happy to translate and clarify...

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