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Synergy horn build

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  • Synergy horn build

    For my last design team build I've decided to do a Synergy horn build. There are some technical challenges so this build could go on for a while. I'm trying to keep this simple enough to be reproducible.

    The design goal (other than to make a Synergy horn), is to design the speaker for home use. As this is for home use at reasonable spl levels, I want to use a conventional tweeter (first challenge). Reasonable SPL levels mean I can also use a single midrange driver (challenge #2).

    I'm using Bill Waslo's Synergy horn spreadsheet to get me started. I will not be using the waist banding flare. I'm also using Horn Response to model the offset drivers in the horn.

    I've built a foam core board model for tweeter testing and have wrapped the testing up last week, so I've order parts. Attached is the current drawing.
    John H

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

  • #2
    Hey John, looks interesting. I'll be excited to watch this one progress and learn from you!
    Voxel Down Firing with Dayton SA70

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    • #3
      I couldn't tell you the first thing about Synergy horns, but I know Bill Waslo has put a lot of information up on the DIYAudio forum.
      Don't waste your money on a new set of speakers, You get more mileage from a cheap pair of sneakers. Next phase, new wave, dance craze, anyways it's still rock and roll to me!

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      • #4
        Is the plan for this to be a two way? I know Tom Danley did a three way horn using 5" closed back mids. Not sure why though.

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        • #5
          I once saw a rather clever implementation using Aura NSW2s for midrange. At $10 each, it'd probably get you down to 500hz.

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          • #6
            The plan is for a 3-way. Tweeter is the RS28A (I mistakenly ordered the F ) I'll post some of the measurements tomorrow. The mid is the GRS 4FR-8, but I'm a bit concerned with the sensitivity as the published specs don't match a 91 dB sensitivity. The woofers are the DCS165-4 subwoofers a pair per side.

            With the offset loading horn loading of the mid and woofer it's pretty tough to do a 2-way unless you use a small full range driver as the tweeter.
            John H

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

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            • #7
              The F might actually be a bit better John. It's natural top end rise can help offset the natural drop from the horn loading.
              https://www.facebook.com/Mosaic-Audi...7373763888294/

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              • #8
                Chuck, I'll check the construction. The best measured tweeters have a phase plug or deflector that change the wave shape to reduce the destructive interference in the 8K to 11K range. The XT25 and the RS28A measured the best.
                John H

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

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                • #9
                  From my foam core model, a few tweeter tests

                  John H

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

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                  • #10
                    Horn response models for the GRS 4FR mid and DCS165 woofers. The roll off on the woofer does not represent a ported enclosure. The key here is to make sure the modeled construction of the driver ports into the horn provide enough overlap for the x-o.

                    John H

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

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