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Seriatim from InDIYana and MWAF

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  • Seriatim from InDIYana and MWAF

    Here is my Seriatim (Latin for "in series") build from Ludicrosity InDIYana and MWAF.

    The drivers are HiVi RT1.3 tweeter and RS180P-8 woofer. The HiVi RT1.3 WE (round face plate) is a direct replacement.

    This speaker uses a series crossover. The crossover transfer functions are shaped similar to the Neville Thiele Method™ (NTM). The slopes are 48dB /octave, eighth order.

    I've been playing with a crossover for positioning this speaker on a shelf and near a wall. I've included this “tweaked” cross over along with the original.

    If the original crossover sounds a bit fat, increase the insulation behind the woofer.

    See the attached PDF for the details.

    Let me know if you see any errors.
    Attached Files
    John H

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

  • #2
    Re: Seriatim from InDIYana and MWAF

    Great work John. This is a super nice speaker. Kinda glad I didn't have to compete against you twice!
    https://www.facebook.com/Mosaic-Audi...7373763888294/

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    • #3
      John H

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

      Comment


      • #4
        Re: Seriatim from InDIYana and MWAF

        Very beautiful design and execution!
        Ever since I saw a pic of those I was wondering about them.

        I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
        "As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara

        High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
        SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
        My Voxel min sub Yet-another-Voxel-build

        Tangband W6-sub

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        • #5
          Re: Seriatim from InDIYana and MWAF

          Beautiful project and congrats on your first place!

          Do you have any off axis measurement ? I'm curious how well your project did off axis being that you cross a 7" driver relatively high (3.8khz ?)

          Chucky

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          • #6
            Re: Seriatim from InDIYana and MWAF

            The subjective results were good. I do not have actual measurements. Here's pic of the modeled response at 45 degrees.
            Attached Files
            John H

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

            Comment


            • #7
              Re: Seriatim from InDIYana and MWAF

              Thanks for sharing what looks to be a great design. I would like to build a version of these using the P/E .56cf flat pack cabs (#300-7064) and flared ports. Precision Ports' website port-length calculator suggests using a tube length of about 6.4 inches to tune a 3 inch diameter port to 50hz. Does this sound right? The suggested 2" diameter port length would only leave .5 inches of tube after subtracting 5 inches from the calculated length (per their instructions). See http://www.psp-inc.com/tools2.html.

              I built a pair of Zaph Audio SR-71s using the same cabinets and they sound fantastic. However, the SR-71s are rear-ported because the baffle lacks space for a front-mounted flare port. Would rear-mounting the port here seriously impact sound quality (they will go on stands, not on a bookshelf)? If so, any other suggestions for commercially available port alternatives? I am confident I can build the rectangular ports per the provided design, but would like to do the build as off-the-shelf as possible to encourage others without advanced woodworking skills.

              I am looking forward to comparing these with my SR-71s down the road.

              Winston

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              • #8
                Re: Seriatim from InDIYana and MWAF

                The rectangular baffle will change the tweeter response a bit so your result will be different. You can you a 2 inch port without a problem. Rear mount is OK.

                If you go rear mount you can use the PE adjustable 2 inch port, http://www.parts-express.com/speaker...table--260-387
                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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                • #9
                  Re: Seriatim from InDIYana and MWAF

                  Thanks for the input. I will post pics once I get started.

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                  • #10
                    So, it has taken 3 years to finally get this project under way (adding a second kid to the family really slowed me down) and I am getting close to assembly. I used the PE .5ft knock down cabinets and made the baffles out of Oak board. The baffles will be finished with gloss poly and the cabinets with white paint to match the trim in my house (my wife’s idea). I have a question about the interior insulation- the specs say Roxul and batting on the sides and back. By Roxul, do you mean mineral wool insulation? Do you use spray adhesive or just cut it fat and press in to place? Thanks, pics are forthcoming. Sent from my iPhone using Tapatalk

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                    • #11
                      Crossover and schematic: Sent from my iPhone using Tapatalk

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                      • #12
                        First coat of paint on the cabinets: Sent from my iPhone using Tapatalk

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                        • #13
                          You can use mineral wool or fiberglass in a polyester batting pillow and place it behind the woofer under the port.
                          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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                          • #14
                            Great, thank you! Sent from my iPhone using Tapatalk

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                            • #15
                              From what I can tell in the picture you might be missing a wire. Also I labeled the woofer positive lead. See attached

                              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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