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  • Originally posted by AxtoneEllison
    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.
    Francis

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    • 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.

      Click image for larger version  Name:	Dayton 10In WG_sb21rdc_0-15-30-45-60-75_no stuffing_mouth measure_part-box.png Views:	0 Size:	328.4 KB ID:	1455494 Click image for larger version  Name:	Dayton 8in WG_sb21rdc_0-15-30-45-60-75_no stuffing_mouth measure_1d125 throat.png Views:	0 Size:	327.0 KB ID:	1455495
      Dan N.

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      • 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.
        ~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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        • 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.

          Click image for larger version  Name:	IMGP6280s.jpg Views:	0 Size:	439.1 KB ID:	1455501 Click image for larger version  Name:	IMGP6282s.jpg Views:	0 Size:	460.9 KB ID:	1455502
          Dan N.

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          • 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.
            Dan N.

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












              ~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

              Comment


              • 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.




                ~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

                Comment


                • 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.





                  ~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

                  Comment


                  • OT19 is nicer than I expected
                    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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                    • Ring radiators do well, but sometimes have a wonky looking top octave from what I've seen so far.
                      ~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

                      Comment


                      • 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.
                        ~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

                        Comment


                        • 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.

                          Comment


                          • 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?

                            Comment


                            • Originally posted by Mainframe View Post
                              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!

                              Comment


                              • 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 !!

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