3D printed waveguides

[fpitas]

So if all I want to print is a 3D model of the www.worktime.com logo, can I just do that with Bliesma T25B? Or do I need additional materials?

Stop being cheap. Those guys deserve a full-size shrine to their ethics and business integrity.

[dlneubec]

Brandon,
Have you done the SB21RDC, the dimple dome version? If not, you really should try it out. I'm using in one in a cut down 10" Dayton round waveguide and the measurements look great and it sounds great. Here is one set of measurements at 0-15, 30, 45, 60 and 75º off axis (no smoothing), I also attached the results with the 8" version, which is quite close (second graph). I tested the SDC version as well, which was quite good, but not as smooth overall as the RDC.

[augerpro]

I should look into that tweeter. Do you have a pic of the cut down 10"? How big is the mouth after you cut it down? I also have the Vifa XT19 I'm going to test along with the Scanspeak I posted above since the fit the same throat.

[dlneubec]

I looked and don't seem to have any good photos. I've attached a couple that I could find. One is from the front and is hard to see, the other shows the rear cut down, but with some stuffing in the throat, which I was playing with at the time and didn't use . I believe I cut it down so the throat was 1.125" in diameter and then did a little cove cut on the inside radius from the back so these measurements are actually with the face plate on the tweeter. The little bump out it has at the face plate opening fits right in the cove cut.

[dlneubec]

I should probably state that I cut down the throat end, no the mouth end, removing the threads and milling it off until I got the throat diameter I wanted to try. So the outside diameter is just a little under 10", iirc. I'm running with a 1400Hz crossover and distortion is very low and I'm getting over 20dB of boost at the crossover point.

[augerpro]

Here's an update of new designs for the T25B, SB26, SB21SDC and SB21RDC, Peerless OT19, ScanSpeak Revelator D2104/7120.

[augerpro]

So I was playing with ABEC and modeling 6" waveguides for the T25B. I wanted to see how a circular mouth might behave even though everyone here preferred the closer CTC of the elliptical mouth. First plot is the 6" vD from a couple posts above and the ABEC model of that waveguide. Following that is a 6" round waveguide with a profile of constant radius, the same radius in fact as vD's horizontal radius. Then I modeled another 6" using an OS profile.

[augerpro]

Small update of 8" waveguides. I've noticed there is something about big waveguides that make problematic tweeters work well. Not sure if it is the mouth size or depth. I'll get the files uploaded to my website by the end of the weekend for this and the last batch of testing since they all came out well.

[jhollander]

OT19 is nicer than I expected

[augerpro]

Ring radiators do well, but sometimes have a wonky looking top octave from what I've seen so far.

[augerpro]

My website is updated with the newest results and files. BTW if anyone has good pics of their waveguide, I'd like to include more on my website.

[Mainframe]

Hi Brandon, you’re work is much appreciated. Feel free to use these images if you like, and I hope to have them in a build by February / March workload depending. I’m very happy with how these turned out. Vendor was Xometry, SLS Nylon media tumbled and dyed black. These could pass for install in a commercial speaker, I was worried they would look a bit home made. Well done mate.

[mememe]

Wow, those look nice.

What do you guys think of using one of these waveguide and tweeter combos for an in-wall speaker design, crossed over with something like the Purifi Audio PTT6.5W04-01A 6.5 Inch Woofer or something similar (sealed)? Mainly for home cinema but can used for hifi also. I don't have a problem with limited depth either (probably have 10 inch depth I can utilize). Thoughts?

[mga2009]

Hi Brandon, you’re work is much appreciated. Feel free to use these images if you like, and I hope to have them in a build by February / March workload depending. I’m very happy with how these turned out. Vendor was Xometry, SLS Nylon media tumbled and dyed black. These could pass for install in a commercial speaker, I was worried they would look a bit home made. Well done mate.

Mainframe, If I might ask... how much does xometry charges for 1 waveguide?


Augerpro, awesome designs! Thank you very much for make them available to everyone!

[sutantoroy]

My first waveguide is using augerpro design. I use the SB26ADC tweeter with 5" No PS waveguide. Its matching beautifully the directivity of the SB15NBAC. Great design augerpro !!