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In Reply to: RE: one horn allowed posted by el`Ol on June 10, 2012 at 03:32:37
A 100+ dB Synergy horn from 150hz and up, on to of one of my PPSL woofers (of course).
Follow Ups:
Does the Synergy really work as a horn from 150 Hz up? Or is it rather a pure bandpass below 1000 Hz?
Hello !!You really should read-up all that is written on Synergy Horns, they are vastly superior, and IMHO most likely "the future".
I have been waiting for someone to offer an affordable DIY project with passive crossovers, for my own home use. Something that is well thought out and well documented, to build without eating into Mr. Danley's patents and his pocket book.
Right now, there seems to be about fifteen brave DIYers building such horns, with wildly differing degrees of understanding, sophistication and repeatability. If you look down in this thread posted below, under the post "Horns & Waveguides/ INDEX of DIY Synergy and Unity Horns" you will see a recent listing of the DIY players, and their efforts to date.
If your audio budget is adequate, by all means, visit a Danley Sound Labs dealer for a demo !!
djk, if you ever come up with something duplicatable, please let me know !! Thanks.
Jeff Medwin
Edits: 06/10/12
In 1981 I built a pair of of this double 12 design, the same basic horn type that Danley uses, but without the HF drivers.This design had usable response to 95hz or so, but at 48" was too wide for its intended use.
It did however get people coming up to me and trying to tell me 'that it wasn't on'. Until you got about 4' away and felt you sinus cavities start to ache, then you realized that it was on, and was rotting your face off. The point was that it sounded natural. It was also easy to build.
What I would like to build would be a double 6" with the Synergy principal that would be usable to 200hz or so, and cross at around 300hz or so. I think it only need be about 24" wide to do this.
Edits: 06/10/12
If you mean where does the horn begin to provide gain over the direct radiating case, that depends on which one you mean.
A Synergy horn like an SH-50 exhibits gain beginning around 100Hz.
Unlike most loudspeakers with a crossover, the frequency ranges in a Synergy horn combine without the traditional phase shift (time shift).
They sum well enough such that even when you put your head inside the horn mouth, you cannot hear there is more than one driver and an SH-50 can reproduce a square wave over more than a decade wide band, spanning both crossovers.
What radiates appears to be one source in time and space (as if it were a single wide band driver) and does not produce a polar pattern of lobes and nulls (an interference pattern) like normal multi way loudspeakers.
It is a much much more complicated system to design than a direct radiator but it does work.
Best,
Tom
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