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  • Yeah I think our coming to different positions on whether hard domes are easier or harder to work with, was due to the path we took at the beginning. You used off-the-shelf waveguides, which tend to be some form of quasi-OS, so your struggled with hard domes, but soft domes worked well. I started with wanting to 3D print, so I had to learn CAD. With little CAD skill, it was easier for me to model profiles based on a simple circle. Which simply by chance worked well with hard domes, but not soft. I think that itself might be a worthwhile lesson to anyone following along. And I will state with some certainty that hard domes do better with circle-based wall profiles, not just from my own measured results, but also the results of working with ABEC to try different contours, including an actual OS.
    ~Brandon 8O
    Please donate to my Waveguides for CNC and 3D Printing Project!!
    Please donate to my Monster Box Construction Methods Project!!
    DriverVault
    Soma Sonus

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    • Refined a couple of the previous designs and measured them today. Also added the first variant for the Peerless DA25TX. I'm surprised by the Peerless, it's a small dome which has worked well for me, but this has a big dip on axis. I would have expected it to measure very close to the SB26ADC given how similar the domes are. I may have to start working in ATH/ABEC for this one to figure out what works.







      ~Brandon 8O
      Please donate to my Waveguides for CNC and 3D Printing Project!!
      Please donate to my Monster Box Construction Methods Project!!
      DriverVault
      Soma Sonus

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      • Did I miss it, are you removing the screens and faceplates on the Scan D3004 and the Peerless DA25TX?
        John H

        Synergy Horn, SLS-85, BMR-3L, Mini-TL, BR-2, Titan OB, B452, Udique, Vultus, Latus1, Seriatim, Aperivox,Pencil Tower

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        • I removed the screen on the Peerless, and the faceplate on the Scanspeak.
          ~Brandon 8O
          Please donate to my Waveguides for CNC and 3D Printing Project!!
          Please donate to my Monster Box Construction Methods Project!!
          DriverVault
          Soma Sonus

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          • Here are some measurements of the Bliesma T25A, to see how it measures on the waveguides I made for the T25B. The domes are very different, the A version is much taller. Clearly there is an issue here, which is disappointing.


            ~Brandon 8O
            Please donate to my Waveguides for CNC and 3D Printing Project!!
            Please donate to my Monster Box Construction Methods Project!!
            DriverVault
            Soma Sonus

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            • The Oneness
              The Oneness commented
              Editing a comment
              Thanks for the reply the other day, missed that you had these posted. Thanks to everyone involved in these projects, massive help to us less knowledgeable/able diy'ers.

              Anyone think they would do decent firing straight back in a car? So I'd be approximately 45° off axis from the drivers side and 30° of axis form the passenger side. Perhaps the null between 0-10° may be beneficial since they would be in the sails panel area firing straight back at the door/window frame.

              Any plans to test the T25S-6? Have a pair I may be able/willing to loan out

          • Originally posted by augerpro View Post
            So far, my best results are from hard domes. It's the soft domes that are tougher. However, after an early elliptical wall contour didn't measure well, I've stuck with a circular contour with constant radius. This has worked great for hard domes. When I see others post decent results with soft domes, it usually appears to be some sort of OS type contour. Along with my experience with hard domes, I've modeled some contours in ABEC (SB26ADC and T25B) and it has agreed with what I found: hard domes typically do better with a constant radius contour, and OS and conical were not that good. Wish I could do the same soft domes, but those are near impossible to model for a DIYer.

            Have you tried any waveguides with planars/ribbons, and or AMT air motion transformers? Any thoughts as what type(s) of curvature(s) and throat angles might be appropriate?
            "Our Nation’s interests are best served by fostering a peaceful global system comprised
            of interdependent networks of trade, finance, information, law, people and governance."
            - from the October 2007 U.S. Naval capstone doctrine
            A Cooperative Strategy for 21st Century Seapower
            (a lofty notion since removed in the March 2015 revision)

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            • I'd really like to get around working with AMTs. Just haven't had time. No idea what contour would work, but I think they might be able to be treated as plane wave sources, which makes design easier to model in something like ABEC. OS or conical would probably work well.
              ~Brandon 8O
              Please donate to my Waveguides for CNC and 3D Printing Project!!
              Please donate to my Monster Box Construction Methods Project!!
              DriverVault
              Soma Sonus

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              • Originally posted by JRT View Post


                Have you tried any waveguides with planars/ribbons, and or AMT air motion transformers? Any thoughts as what type(s) of curvature(s) and throat angles might be appropriate?
                I've tried a few WGs with planar tweeters that provided adequate, but not outstanding results. I'm curious about others experience.

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                • Originally posted by augerpro View Post
                  Here are some measurements of the Bliesma T25A, to see how it measures on the waveguides I made for the T25B. The domes are very different, the A version is much taller. Clearly there is an issue here, which is disappointing.


                  Ignore my comment on the post, wasn't sure how this forum works.

                  Thanks for the reply the other day, missed that you had these posted. Thanks to everyone involved in these projects, massive help to us less knowledgeable/able diy'ers.

                  Anyone think they would do decent firing straight back in a car? So I'd be approximately 30° off axis from the drivers side and 45° of axis form the passenger side. Perhaps the null between 0-10° may be beneficial since they would be in the sails panel area firing straight back at the door/window frame.

                  Any plans to test the T25S-6? Have a pair I may be able/willing to loan out
                  Last edited by The Oneness; 01-08-2022, 10:29 PM.

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                  • Here are two more variants of the T34B waveguides, and a new Scanspeak R2904/7000 waveguide. I'll be adding the T34B designs to my website in a few weeks.









                    ~Brandon 8O
                    Please donate to my Waveguides for CNC and 3D Printing Project!!
                    Please donate to my Monster Box Construction Methods Project!!
                    DriverVault
                    Soma Sonus

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                    • 'm making a test cabinet to do some research on edges before I start final designs on a family of speakers. This gave me a chance tonight to try my routing template. Worked as expected, so I'll get them posted on the website soon. This will require changing all of the waveguides a bit, so if you are relying on using the routing template, I would hold off on downloading any waveguide files right now. You'll know when you can download them when the template files are available, and I always have a revision log at the top of every page where I note updates.



                      I tried using double-sided tape to hold the template in place, but it didn't stick well. I ended up using a finish nailer to attach. I thought about integrating screw holes into the design, but I like that the finish nail leaves a tiny mark that is easy to fill. Any other ideas for attaching them before I do a final template design?





                      ~Brandon 8O
                      Please donate to my Waveguides for CNC and 3D Printing Project!!
                      Please donate to my Monster Box Construction Methods Project!!
                      DriverVault
                      Soma Sonus

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                      • Do a search for blue tape and super glue method or blue tape and CA glue method.
                        Also, maybe try a different double sided tape. The most recent stuff i got from Menards was way too sticky and would actually pull up the mdf. I settled on a compromise and used the blue tape with the overly sticky double sided tape in between.

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                        • I'd rotate the SB woofer 90 degrees counter-clockwise
                          Craig

                          I drive way too fast to worry about cholesterol.

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                          • I like the blue tape on both pieces with CA glue in between. Small marks at the bottom of the template hole makes it easier to align the template. The router bushing rides higher than the marks or rides over any indentations.
                            John H

                            Synergy Horn, SLS-85, BMR-3L, Mini-TL, BR-2, Titan OB, B452, Udique, Vultus, Latus1, Seriatim, Aperivox,Pencil Tower

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                            • I've finally added router templates for elliptical waveguides to my website! You'll need 5/16" OD and 1" OD template guide bushings to use them. There are holes that will accept #4 sheetmetal screws, or you can use a finish nailer, or double-sided tape to attach them. https://www.somasonus.net/waveguides
                              ~Brandon 8O
                              Please donate to my Waveguides for CNC and 3D Printing Project!!
                              Please donate to my Monster Box Construction Methods Project!!
                              DriverVault
                              Soma Sonus

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