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MiniByzy (Mini Byzantium) Build Thread

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  • Re: MiniByzy (Mini Byzantium) Build Thread

    Hi Pete,

    Thanks for documenting your build.

    Can the MiniByzy be built as a floorstander? Keep the baffle width the same but not as deep and more vertical (same volume)? How important is the pointed top baffle/waveguide? I don't know if any of us are up to building a complex curved cabinet. I did order a pair of the Vifas when they were on sale, but have not had time to test them (hope I got a good pair). If not I'll return them and go for the 8ohm version instead. Thanks.

    Comment


    • Re: MiniByzy (Mini Byzantium) Build Thread

      Originally posted by raiderone View Post
      Hi Pete,

      Thanks for documenting your build.

      Can the MiniByzy be built as a floorstander? Keep the baffle width the same but not as deep and more vertical (same volume)? How important is the pointed top baffle/waveguide? I don't know if any of us are up to building a complex curved cabinet. I did order a pair of the Vifas when they were on sale, but have not had time to test them (hope I got a good pair). If not I'll return them and go for the 8ohm version instead. Thanks.
      I suppose it could be a floor stander. But it's only 1.2 cubic feet. Maybe a false bottom holding the crossover to add some height. I'd not want to sacrifice too much cabinet depth, as I think that helps contain the midrange standing waves when the interior has a good chunk of Roxul in the middle.

      I don't know how much the baffle shape eating into the guide affects the response. I'll learn more about that when the RS225/RS28F project shows up. Ed's cutting the baffles right now. Those will be full waveguides with no truncated edges. I'll be starting a new thread to document that build, since it will be much easier for someone to duplicate. I think we'll take these to Dayton next summer.

      While I'm here, I suppose I'll post the final response of the RS28F XO after a couple more small tweaks. I gotta call this one done.

      R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
      Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51

      95% of Climate Models Agree: The Observations Must be Wrong
      "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

      Comment


      • Re: MiniByzy (Mini Byzantium) Build Thread

        That looks really great Pete!

        I agree...I think you've taken that design and perfected it about as much as you can.

        Now, if Pete decides to part with them, who will be the lucky one to wake up with these speakers under their tree?:D

        Comment


        • Re: MiniByzy (Mini Byzantium) Build Thread


          Quit obsessing, and come over and pick up this pair for yourself. ;)

          Ho Ho Ho, Merry Christmas!!! :D

          Oh the temptation is mighty (as I look around for what I can liquidate...)

          Comment


          • Re: MiniByzy (Mini Byzantium) Build Thread

            Yes, red is the RS28A.

            The speaker wasn't in the exact same spot, so the low end response is slightly different.

            Quit obsessing, and come over and pick up this pair for yourself. ;)

            Ho Ho Ho, Merry Christmas!!! :D

            Here's how the A and F differ in the waveguide. I'm wondering if the aluminum dome might be just a bit better suited to the additional loading provided by the waveguide.

            Makes me wonder if the felt dot in the RS28A is assisting nicely.
            diVine Audio

            Comment


            • Re: MiniByzy (Mini Byzantium) Build Thread

              Originally posted by cjd View Post
              Makes me wonder if the felt dot in the RS28A is assisting nicely.
              I was wondering if the fact that it's aluminum allows the diaphragm to better handle the increased acoustic loading.

              The top octave performance of the RS28A sure seems improved in the guide over just being on a flat baffle. I'd think that would be where the pad would be contributing.

              When the L.O.K.I. baffle gets here, I can do a swap with the same signal and get a better side-by-side comparison. That response above was two different runs, so I don't know if test conditions were identical. Not sure if I got the levels matched at the correct frequency, so it may all be just increased output above 3KHz on the part of the RS28F. At least I know I can dial in a +- 1.5dB response from either one.
              R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
              Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51

              95% of Climate Models Agree: The Observations Must be Wrong
              "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

              Comment


              • Re: MiniByzy (Mini Byzantium) Build Thread

                Thought I'd post another set of plots at 20, 45, and 60 degrees of the current version.

                What do you waveguide/horn guys think of this?

                1/6th octave smoothing.


                R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
                Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51

                95% of Climate Models Agree: The Observations Must be Wrong
                "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

                Comment


                • Re: MiniByzy (Mini Byzantium) Build Thread

                  Looks almost as good as that new pic in your avatar. Pretty remarkable to me how little and consistently the response falls off axis across that entire range.

                  Comment


                  • Re: MiniByzy (Mini Byzantium) Build Thread

                    Originally posted by CUtiger View Post
                    Looks almost as good as that new pic in your avatar. Pretty remarkable to me how little and consistently the response falls off axis across that entire range.
                    No kidding. It still shocks me how well that guide controls the tweeter radiation. The balance from the top of the band to the bottom maintains its character much better than a flat baffle implementation.

                    Here's the off axis performance of the RS28F on a flat baffle, courtesy of MarkK.

                    R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
                    Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51

                    95% of Climate Models Agree: The Observations Must be Wrong
                    "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

                    Comment


                    • Re: MiniByzy (Mini Byzantium) Build Thread

                      Looks great Pete!

                      Here's one for ya. Can you guess which speaker this is from? (Hint, you were invloved indirectly):D

                      Dan N.

                      Comment


                      • Re: MiniByzy (Mini Byzantium) Build Thread

                        Originally posted by dlneubec View Post
                        Looks great Pete!

                        Here's one for ya. Can you guess which speaker this is from? (Hint, you were invloved indirectly):D
                        Hmmm . . . Surroundround?
                        R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
                        Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51

                        95% of Climate Models Agree: The Observations Must be Wrong
                        "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

                        Comment


                        • Re: MiniByzy (Mini Byzantium) Build Thread

                          Righto! A little different form of directivity.
                          Dan N.

                          Comment


                          • Re: MiniByzy (Mini Byzantium) Build Thread

                            I am curious about the effect of the radius edge around the woofer opening, how has that affected the sound from the woofer? Perhaps I missed discussion about this earlier in the posts, if so, could you tell me where to look. Thank you!

                            Comment


                            • Re: MiniByzy (Mini Byzantium) Build Thread

                              Originally posted by TN Allen View Post
                              I am curious about the effect of the radius edge around the woofer opening, how has that affected the sound from the woofer? Perhaps I missed discussion about this earlier in the posts, if so, could you tell me where to look. Thank you!
                              At the frequencies of operation, that roundover has no effect on the woofer response. The cone is too wide, and the roundover too small for it to act as any kind of diffraction obstacle.
                              R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
                              Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51

                              95% of Climate Models Agree: The Observations Must be Wrong
                              "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

                              Comment


                              • Re: MiniByzy (Mini Byzantium) Build Thread

                                It's attractive! I thought perhaps there was an advantage over flush mounting the woofer.

                                Comment

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