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Synergy horn build

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  • jhollander
    replied
    This is just the prototype...Mid, woofer, and new port tubes installed. Tweeter needs to be trimmed

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  • jhollander
    replied
    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

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  • jhollander
    replied
    Added tweeter mounting blocks and flattened. Good view of the woofer standoff rings.

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  • jhollander
    replied
    Wings installed

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  • jhollander
    replied
    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

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  • jhollander
    replied
    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

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  • TN Allen
    replied
    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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  • skatz
    replied
    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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  • bwaslo
    replied
    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.

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  • TN Allen
    replied
    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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  • bwaslo
    replied
    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!

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  • jhollander
    replied
    Tim, Bill could probably give a better explanation. For me it's about controlled directivity with fewer room interactions. I've done narrow baffle, open baffle, and tested some omni's, so for me this will be going in a completely opposite direction.

    We'll see what the actual benefits turn out to be in a home environment. Assuming I can make a passive x-o work, this should be fun to compare to all the other RS28A speakers.

    Here are a few links
    http://www.danleysoundlabs.com/produ.../synergy-horn/
    http://www.danleysoundlabs.com/danle...apped-Horn.pdf

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  • TN Allen
    replied
    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?

    Leave a comment:


  • jhollander
    replied
    Right out of the box, with measured VAS and TS parms the sensitivities were 88 and 89. There was some inconsistency in the driver TS measurements. I should probably repeat/ check at 2.83v 1M in box.

    The surround to the front edge of the gasket looks like about 2.5 mm. At half the xmax of 1.5mm the surround should not hit the side wall.

    I'll be at MWAF this week, do you want me to send you one with a mailing tube kit?

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  • bwaslo
    replied
    The GRS looks pretty nice. Looks like you could mount it to a horn wall without a big spacer or worrying about the cone crashing, too. Is it's sensitivity like advertised?

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