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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
    Translam Subwoofers - The Jedi Mind Tricks

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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.
      "The large print giveth and the small print taketh away." -Tom Waits

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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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                    • #11
                      John
                      How is this coming, will you have it for MWAF?

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                      • #12
                        Could you use your own "phase plug" on the F tweet?
                        A mains
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                        • #13
                          This is not going to make MWAF this year. I'd be happy if I made the Design team end in September.

                          I made a bunch of tests with phase plugs, unfortunately none with the F model. What I found was that I could not get the shape right or close enough to the dome to stop the destructive interference. Most of the tweeters I tested were 1 inch dome that were recessed behind the face plate. The XT and RS that performed better also had very little recess.

                          Note the Wolf added a grill and phase plug to his TL labs tweeter. He might have some interesting measurements. If you are following the wave guide thread, I do think the edge overlap is important.

                          John H

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

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                          • #14
                            John

                            Do you have a link to Bill Waslo's spreadsheet for the synergy horn? I have a terrible time every time I try a search on DIYaudio, usually don't find things I know to be there!

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                            • #15
                              Here's Bill library link http://libinst.com/SynergyCalc/

                              Bill and I had a discussion about some of the calculations used for Horn Response. That aside the spread sheet is great for figuring out the angles to cut. I removed the waist banding/ last flare from my horn.
                              John H

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

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