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MiniByzy (Mini Byzantium) Build Thread

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  • Re: MiniByzy (Mini Byzantium) Build Thread

    Originally posted by greywarden View Post
    Can you get a smooth, glassy finish with powdercoat, though?
    Yes, I had a shift knob and some other car accessories powdercoated and they all came out with a nice gloss black finish. Imo, it would be an easier and cheaper to get a nice finish from powdercoating than having a bodyshop spray them.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

    http://www.diy-ny.com/

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    • Re: MiniByzy (Mini Byzantium) Build Thread

      It was a very productive day on Friday.

      We actually got some measurements on the woofer and tweeter in the enclosure, and listened to some music with a crossover installed.

      First, that waveguide performs incredibly well with the RS28F, using a pretty darn simple network. We took a distortion sweep, and with the network in place, we were looking at amplifier distortion levels from 1000Hz on up, 0.1% and better, mostly 2nd order. And the response plot was flat from 1200 to just above 15KHz. Over that range, maybe +- .5dB. The "glitch" above 15Khz is a very narrow 2dB dip, returning to reference level at 20KHz. One thing's for sure . . . I don't see any baffle diffraction ripple. There's no way the RS28F, flush mounted on this baffle, would have the super smooth response this does, without using massive roundovers.

      The woofer was a real surprise. This Vifa "Subwoofer" has a fairly smooth response out to 10KHz. That was the surprise. We were getting some really nice bass output from that single 8" unit.

      Overall, the first crack at a crossover shows real promise. We listened to a few tracks, and I sure was liking what I heard. A little tweaking might still be in order, but we'll know better when there's a stereo pair playing.

      I'll post those plots later. It was late, and Ryan's laptop ran out of juice before we could complete another set of measurements.
      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.

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      • Re: MiniByzy (Mini Byzantium) Build Thread

        My camera is [email protected], and wouldn't improve on the picture above, believe me. That's exactly how they look right now, but you can't get an idea from a picture of how smooth they actually are when you put your hand on them.

        The next pics of these will be of the baffle and enclosure finishes in their various stages of completion.

        Debating whether to paint, powder coat, or vinyl wrap the baffles. I love the idea of powder coat, as they have some that cure at 350 in 10 minutes. We'll be doing a trial with a sealed MDF baffle before I submit the baffle Ed made for these enclosures.
        I powder coat for a living, but I've never tried to paint speakers with it. It does leave a very nice hard finish.
        Eric L.

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        • Re: MiniByzy (Mini Byzantium) Build Thread

          I didn't know you could powder coat wood...learned something new.

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          • Re: MiniByzy (Mini Byzantium) Build Thread

            Originally posted by winslow View Post
            I didn't know you could powder coat wood...learned something new.
            If you heat the wood to a really high temperature the powder will stick to it and start to melt. My company doesn't have the capabilities to do this, however. We only do metal parts, and use the normal electrostatic charge to attract the powder coat. It's an interesting idea though.
            Eric L.

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            • Re: MiniByzy (Mini Byzantium) Build Thread

              Yea, battery died and I didn't save measurements ... no worries though, I'm sure I'll take about 10,000 more measurements in the process.

              The first stab passive network had a bit of a bump centered around 700hz, which is normally a very bad area to have a bump. Any metal cone woofer with a bump there can melt ears, but the Vifa sounds damn smooth even with the bump. I think we're going to be very glad we chose that woofer!

              And I couldn't believe as Pete said, how smooth the RS28 is in that waveguide. It makes a 1st order network simple, and with the network in place it had less than .1% THD all the way down to below the xover at 1000hz.

              We'll probably have the stereo pair running tomorrow or Tuesday, will post pics and measurements soon. I've been swamped trying to finish up a couple orders and get them shipped.
              Vapor Audio

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              • Re: MiniByzy (Mini Byzantium) Build Thread

                Did some extended listening with the pair yesterday. While there's still a little tweaking yet on the woofer, it seems to me that the tweeter is dialed in. And does it sound fantastic in that WG! There was plenty of crisp attack, and effortless reproduction. That WG and RS28F were made for each other!!!!

                Those two little woofers had the room pressurized nicely on many occasions. And even when they were pumping it out, the midrange stayed flawless. There was a nice tall, wide and deep soundstage to go along with the impressive dynamic capabilities. One track I played had a cello as the featured instrument . . . mmmmmm. It was like he was in the room. :p

                Anyway, a little more eval time is in order, to make sure that the NE225W is dialed in. Should have that finished by the weekend.

                Seriously considering painting the whole cabinet in Cadillac Black Diamond . . .
                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.

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                • Re: MiniByzy (Mini Byzantium) Build Thread

                  Hell yeah. I might have to stop by on my 5k mile roadtrip from AK to FL next year and have a listen!

                  रेतुर्न तो थे स्रोत
                  return to the source
                  leviathan system thread
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                  instagram :: greywarden_13

                  in war, victory . . . in peace, vigilance . . . in death, sacrifice.

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                  • Re: MiniByzy (Mini Byzantium) Build Thread

                    Hi Pete,

                    Which version of the NE225w are you using, 4 ohm or 8 ohm? Thanks.

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                    • Re: MiniByzy (Mini Byzantium) Build Thread

                      Originally posted by greywarden View Post
                      Hell yeah. I might have to stop by on my 5k mile roadtrip from AK to FL next year and have a listen!
                      We're certainly on the way. We'd be happy to show it off!!!

                      Originally posted by raiderone View Post
                      Hi Pete,

                      Which version of the NE225w are you using, 4 ohm or 8 ohm? Thanks.
                      4 Ohm. But the parameters of both woofers will allow either to work in the enclosure, with a 3dB loss of sensitivity for the 8 Ohm.
                      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

                        Well, we're on the third iteration of the crossover, and the "magic" is starting to happen.

                        Ryan ran a sweep yesterday with the new XO in place. With power input over 1W, how's no more than 0.3% THD from 150Hz to 20KHz? And 0.1% from 1000Hz on up? Not too shabby!!!

                        Response plots will be coming once the final voicing is accomplished.

                        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

                          This is an incredible build. Can't wait until it's completely finished, those cabinets look unbelievable.

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                          • Re: MiniByzy (Mini Byzantium) Build Thread

                            They can't possibly sound good looking like that. Put some clothes on them. :p :D

                            Seriously, those are awesome.

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                            • Re: MiniByzy (Mini Byzantium) Build Thread

                              Those look awesome. Couldn't you do a round over around the baffle edges though???

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                              • Re: MiniByzy (Mini Byzantium) Build Thread

                                Originally posted by killersoundz View Post
                                Those look awesome. Couldn't you do a round over around the baffle edges though???
                                They'll be rounded just a bit. No more than 3/8". But they're not ready for the final finish yet. They overhang the cabinet by 1/16" currently, and will be sanded to the proper size. At that time, I'll add the small round over. Any round over won't affect diffraction at this point, but it will make for a nice look when painted.
                                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

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