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Linehopper: An Esoteric build

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  • Linehopper: An Esoteric build

    Greeting all,

    I have just begun construction of a somewhat unique looking
    two way speaker system. Since the cabinets will have an
    unusual shape, I would like to detail my construction steps
    here as I go along. Feel free to make comments or suggestions.

    The concept is essentially a small "bookshelf-speaker-on-a-stand"
    with the stand being molded into a tapered transmission line.
    My goal is to create a speaker that looks arresting & dynamic
    by using converging diagonal lines to create tension. At the
    same time, the shape is intended to be functional, distributing
    resonances and reducing the effective baffle size to that of a
    small bookshelf speaker on a stand.

    Click image for larger version

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    This is going to be quite the adventure trying to build these
    odd looking cabinets. I have a plan; it looks good on paper;
    and I am ready to make sawdust. Hopefully I will have a working
    cabinet ready for DDIY2015 and a fully finished high gloss ready
    for MWAF2015. Wish me luck!

    SYSTEM DESCRIPTION:

    Type: Small, floor standing 2-way using a Paul K. designed
    tapered transmission line.

    Drivers: Dayton ES180Ti-8 woofer & ES25Nd-4 tweeter

    Click image for larger version

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    Xover: TBD via additional OmniMic testing & Xsim modeling. When
    the final cabinets are completed, I will run up & post a
    full set of horizontal, vertical, on-axis & power response
    simulations to serve as a basis for component selection.

    Material: 3/4" MDF with internal bracing.

    Finish: Contrasting multi-color gloss with diagonal accents &
    shadow lines.

    Name: dcibel commented that my speaker looks like its going to
    hop away. I replied that, hopefully, it will not hop away
    before I have a chance to build & measure it. :p
    Linehopper: http://techtalk.parts-express.com/sh...Esoteric-build
    Plan-Tanic: http://techtalk.parts-express.com/sh...ght=Plan-Tanic

  • #2
    Re: Linehopper: An Esoteric build

    I asked Paul K. to model a tapered transmission line for me based
    on my tentative sketches and measured TS parameters. Here is what
    Paul came up with:

    Click image for larger version

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    The line is 59" long and is tapered from 78 square inches at the
    beginning area to 4.875 square inches at the ending area. Overall
    system tuning is 31Hz. Here are Paul's models for port/driver output
    and overall frequency response:

    Click image for larger version

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    Thanks, Paul, for all your help on this!
    Linehopper: http://techtalk.parts-express.com/sh...Esoteric-build
    Plan-Tanic: http://techtalk.parts-express.com/sh...ght=Plan-Tanic

    Comment


    • #3
      Re: Linehopper: An Esoteric build

      I built a small pair of prototype cabinets and took them to IowaDIY.
      We played them at the hotel on Friday night by themselves and then
      again on Saturday night crossed over to my Titanic MK III subs.

      Here are some pics:

      Click image for larger version

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      When I get the TL's built, the drivers will be transplanted, and a
      new set of FRD's will be generated. When developing the crossover,
      I will be running & posting simulations for vertical and horizontal
      polar response using Bill Waslo's recommended procedures. I will also
      simulate & post on-axis response as well as overall power response.
      Linehopper: http://techtalk.parts-express.com/sh...Esoteric-build
      Plan-Tanic: http://techtalk.parts-express.com/sh...ght=Plan-Tanic

      Comment


      • #4
        Re: Linehopper: An Esoteric build

        Here are the WT3 measured free air TS parameters for my pair
        of woofers. Measurements were taken after a 3 hour break-in
        followed by a short cool off period to let the TS parameters
        settle:

        Click image for larger version

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        Here are the WT3 measured TS parameters for my pair of tweeters,
        straight out of the box with no break-in. They show an unusual
        looking curve with twin peaks. Fs measures a little high on both
        tweeters, but these figures will probably drop a little as the
        drivers break in:

        Click image for larger version

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        Last edited by 4thtry; 11-02-2014, 07:30 PM.
        Linehopper: http://techtalk.parts-express.com/sh...Esoteric-build
        Plan-Tanic: http://techtalk.parts-express.com/sh...ght=Plan-Tanic

        Comment


        • #5
          Re: Linehopper: An Esoteric build

          I created a full-scale template of Paul's drawing:

          Click image for larger version

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          I transferred the template onto a large 24.5x48.5 sheet of MDF:

          Click image for larger version

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          Linehopper: http://techtalk.parts-express.com/sh...Esoteric-build
          Plan-Tanic: http://techtalk.parts-express.com/sh...ght=Plan-Tanic

          Comment


          • #6
            Re: Linehopper: An Esoteric build

            I love that cabinet design. Can't wait to see how it goes.

            Comment


            • #7
              Re: Linehopper: An Esoteric build

              I then cut the side profiles out with a circular saw:

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              That is where the project stands at the moment. Next week
              I will be building a pair of custom "separation" jigs to
              clamp the profiles in perfect alignment. I can then start
              cutting the front, top, back, and bottom panels and gluing
              them into position.


              Bill
              Linehopper: http://techtalk.parts-express.com/sh...Esoteric-build
              Plan-Tanic: http://techtalk.parts-express.com/sh...ght=Plan-Tanic

              Comment


              • #8
                Re: Linehopper: An Esoteric build

                The design is wild and stunning, I can't wait to see what they look like in the end.
                Last edited by JasonP; 11-02-2014, 05:32 PM.
                Audio: Media PC -> Sabre ESS 9023 DAC -> Behringer EP2500 -> (insert speakers of the moment)
                Sites: Jupiter Audioworks - Flicker Stream - FRD Consortium Archive - Proud Member of Midwest Audio Club

                Comment


                • #9
                  Re: Linehopper: An Esoteric build

                  May I propose a pair of dowel rod joiners to run from the foot to the bottom of the 'cab' to brace/stiffen the ankle joint? These may very well be 'springy' at least a bit in finale without it.

                  Later,
                  Wolf
                  "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
                  "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
                  "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
                  "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

                  *InDIYana event website*

                  Photobucket pages:
                  http://photobucket.com/Wolf-Speakers_and_more

                  My blog/writeups/thoughts here at PE:
                  http://techtalk.parts-express.com/blog.php?u=4102

                  Comment


                  • #10
                    Re: Linehopper: An Esoteric build

                    With both sides cut already you could do some testing to see if it is springy at the ankle if its not then move on (it will get stronger when you add the front and back). If it is springy you could add a divider brace inside that would preserve the external aesthetics.

                    Comment


                    • #11
                      Re: Linehopper: An Esoteric build

                      So you didn't have the same problem with the tweeter I had? One of the wire terminals was exactly aligned with one of the mounting holes making the tweeter unusable. I sent it back without doing any measurements on it... didn't see the point in even testing it.

                      mk

                      Comment


                      • #12
                        Re: Linehopper: An Esoteric build

                        Originally posted by montekay1 View Post
                        So you didn't have the same problem with the tweeter I had? One of the wire terminals was exactly aligned with one of the mounting holes making the tweeter unusable. I sent it back without doing any measurements on it... didn't see the point in even testing it.

                        mk
                        Nice to see you in here, Monte!

                        I've had this issue before with other 5-hole faces. In my case, I just unscrewed the faceplate mounts and rotated the face to where it was no longer of concern.
                        Now- if the face is glued down in anyway, this is not a method that will resolve it.

                        Later,
                        Wolf
                        "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
                        "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
                        "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
                        "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

                        *InDIYana event website*

                        Photobucket pages:
                        http://photobucket.com/Wolf-Speakers_and_more

                        My blog/writeups/thoughts here at PE:
                        http://techtalk.parts-express.com/blog.php?u=4102

                        Comment


                        • #13
                          Re: Linehopper: An Esoteric build

                          I didn't bother trying to rotate it. Looking at the one I had, photo's on the PE site and photos on the Dayton site I get the impression they are random. If so you will have to cut a custom baffle each time you use one. So I'm thinking I'll wait for a 2nd production run on these things and hope they do a little better job with quality control the next time around.

                          mk

                          Comment


                          • #14
                            Re: Linehopper: An Esoteric build

                            Daring design – subscribed. I can’t fathom all those angles. Best of luck!!
                            Bryan K.

                            Midwest Audio Club

                            Speedster | Sub Attachť | The Wildeman | Sean's NLA Towers | CO‹GAR, COUGAR II and CO‹GAR JR | Triton | Lithium | J-Boom | Trym MLTL | Docere MLTL

                            Comment


                            • #15
                              Re: Linehopper: An Esoteric build

                              Originally posted by montekay1 View Post
                              So you didn't have the same problem with the tweeter I had? One of the wire terminals was exactly aligned with one of the mounting holes making the tweeter unusable. I sent it back without doing any measurements on it... didn't see the point in even testing it.

                              mk
                              Yes, my tweeters did suffer a little bit from this issue. On one driver, the plus & minus terminals were symmetrical with respect to the mounting holes. On the other, however, the negative terminal was fairly
                              close to one of the mounting holes. My workaround was to simply move my terminal clearance routing over just a little bit so that the flange mounting hole & gasket did not interfere with the asymmetrical terminal.

                              Bill
                              Linehopper: http://techtalk.parts-express.com/sh...Esoteric-build
                              Plan-Tanic: http://techtalk.parts-express.com/sh...ght=Plan-Tanic

                              Comment

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