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  • #31
    There are a number of advantages to Synergy (or Unity) type horn speakers ==

    * constant directivity over a wide range. Imaging is very good and can be good over multiple listening positions with proper toe-in.
    * The horns are essentially conical and usually short, so no "horn honk", but help reduce early reflections in rooms and sound louder in front of the speakers than out away from the area.
    * Point source coaxial behavior, sound doesn't change much at different positions around the coverage area. Unlike most speakers using horns. that have drivers for different frequency ranges spaced out away from each other so they make interference patterns around crossover points. When done well, a Synergy speaker sounds pretty much the same from 6 feet away and off to a side as it does with your head stuck inside the horn!
    * good (though not insanely high) efficiency/sensitivity, typically around 93 to 100dB/2.83V/1m. High SPL capability
    * my favorite, the mid and woofers operate in acoustic bandpass arrangements, which means that out-of-band distortion products are reduced by the physical arrangement after amplifiers and speaker distortion generating mechanisms. In usual multi-way speaker systems, distortion from midranges and woofers go out unimpeded into the room. Don't know if that's the cause, but the sound quality can be shockingly clean and clear.
    * possible to make with linear phase (also called "waveform faithful", perfect impulse response, flat delay, other names), even with passive crossovers. Not easy, though (and I don't personally find it all that significant).
    * can be made smaller than other multiway horn systems.
    * they can be designed to work well back against a wall in small rooms. Which doesn't compete so well at MWAF, where they force all the speakers to be out multiple feet, but work better in real rooms many of us have.

    You might say I'm a fan!
    Free & Free-form simulator/designer for Passive Crossovers
    SynergyCalc 5: design spreadsheet for Wooden horns and DIY Synergy Waveguides
    Super easy and cheap to make high performance sound diffusers

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    • #32
      Thank you for the explanations and links. This begins to interest me more. Some of the benefits are similar to what I find using a combined midrange and tweeter waveguide. It appears too that some of the design, construction and milling challenges are also similar.
      I'll spend some time looking at the information, then probably ask more questions.

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      • #33
        TN Allen, you might want to look at my pdf doc at the links below for more Synergy horn propaganda.
        There is also an xls doc at
        http://libinst.com/SynergyCalc/
        which is a spreadsheet for wood cutting of a Synergy/Unity (or even a simple one-driver) wood conical horn.
        Free & Free-form simulator/designer for Passive Crossovers
        SynergyCalc 5: design spreadsheet for Wooden horns and DIY Synergy Waveguides
        Super easy and cheap to make high performance sound diffusers

        Comment


        • #34
          Originally posted by TN Allen View Post
          This looks like an interesting project. Can someone suggest a link to an explanation of the benefit of this type of enclosure, or perhaps explain it?
          Here you go.
          http://www.danleysoundlabs.com/danle...apped-Horn.pdf

          Steve

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          • #35
            I've looked around a little today at the links provided above. I'm wondering if there would be any advantage to a Synergy horn with more complex surfaces blending the openings with the horn surface? I can see some aesthetic possibilities, but these would be a waste of time and effort if there were no acoustic advantage.

            I'm intrigued with the possibility of designing a complex blend of surfaces for 3D printing, or CNC milling. Your photos of the printed guide on Brandon's wg thread started this train of thought. I can see possibilities for a more organic appearance, Gaudi comes to mind.

            I'm also trying to understand the concept, and comparing it to what I did with the double wgs. It hadn't occurred to me to try focusing all of the drivers as closely, or to shift these away from axes perpendicular to the baffle front and back surfaces.

            Baring the practicallity of having to make an ideal horn configuration, what would that configuration be? Is there any acoustic reason to look beyond what you are both doing presently?

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            • #36
              Tim there are lots of horn shapes, but my thought would be a large SEOS, oblate spheriod style that could incorporate 3 drivers. Bill did a SmallSyns with the large SEOS but the woofers were not in the horn mouth.

              It also depends on what your design goals are. This design's goal is to incorporate a traditional tweeter in a synergy horn for controlled directivity and point source behavior in a home setting. Plus because it's a Design Team project this design should be buildable by others.

              If my design goal was max spl the shape would be more Edmund Sharpe/ Danley style
              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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              • #37
                Fitting the port and midrange on the same panel was tight. PE approved the tweeter swap from the RS28A to the XT25TG30. Mailed the RS28As back

                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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                • #38
                  Wings installed
                  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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                  • #39
                    Added tweeter mounting blocks and flattened. Good view of the woofer standoff rings.

                    John H

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

                    Comment


                    • #40
                      Added hanger bolts unfortunately not that straight. The front gasket is pretty squishy so I think I can get buy with fewer than 8 bolts per woofer. Port tubes did not allow the woofers to be installed, and I can't reach the nuts for the mid...remaking the mid mounting

                      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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                      • #41
                        This is just the prototype...Mid, woofer, and new port tubes installed. Tweeter needs to be trimmed
                        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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                        • #42
                          10 lbs in the 5 lbs bag. Now it's time to take it apart and finish building the rest of the box so testing can start. I'll be disappointed if the holes need to be changed.
                          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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                          • #43
                            Very cool project! I had a chance to listen to the Danley (SH-50 I believe) in a shootout of 5-6 designs. I thought the image placement / depth was very good as well as dynamics. Width was a little too narrow for me so there was a lack of envelopment that you get from a really good wide dispersion design.

                            Tonally though I noticed some problems and specifically ringing in the output. I don't know the exact culprit - drivers, crossover, or resonances but I suspect it may have been the latter that had the largest negative impact. It will be interesting to see what you think.

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                            • #44
                              I did notice large amounts of plastic in the Danley horn vs. mdf here. I'm most interested in the change in dispersion and pattern control at higher frequencies compared to traditional driver on baffle speakers.
                              John H

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

                              Comment


                              • #45
                                John,

                                I'm curious about the way you will evaluate dispersion and pattern control. That's been the reason I don't test guides, I haven't seen a setup that considers the particular characteristics of a guide that correlate specifically to improved sound, and that can be easily quantified. Perhaps you will include photos and explanation of your setup?

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