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In Reply to: Re: horn stuff and final conclusions posted by Wayne Parham on July 15, 2002 at 16:33:51:
Wayne wrote:
------------
Tom, you did not invent the conical horn. You cannot claim to invent a Salmon family horn, or take credit for their physical properties. Your Unity is a system that uses a compression driver. The driver in your Unity horn system has a one inch exit, so your horn cannot claim to effectively load frequencies past that wavelength. The compression driver manufacturer might, but then that means they have a smaller orifice or phase plug or both. Further, the compression device required sets the bandwidth limit of the device. To claim operation "4 octaves higher" requires a leap of faith that such a 1" exit compression device could be made to operate this high.Such ultrasound operation not possible with the devices you currently use in the Unity design, and no suitable replacements exist. The part required for UHF operation is a hypothetical and non-existant device, so you cannot realistically claim performance at these frequencies from the Unity. I'm not even sure why you would suggest such a thing; It's smacks of the UFO stories on Art Bell's show.
It is these kinds of exaggerations and equivocations that have been at the root of this debate. I like the fundamental, large-format conical horn design, but no horn manufacturer of products intended to mount 1" compression devices claims to provide usable response to 48Khz. It is not appropriate for you to mention this in connection with your Unity device either. Please see my previous post called "UHF."
------------Wayne,
I still feel like there is a huge language barrier which is filtering much useful discussion. We have a few instances here of your own presumption of what we have claimed and other cases where you have your own connotative definitions which differ from the veracular of the industry.
I guess the first point to clarify is that the Unity Summation Aperture is NOT a single specific embodiment of the design. It is the concept and relationship between the drive units, a lens, the loading points of the drive units, and the bandwidth each cover. The design can be extended in either direction, toward high frequency or low frequency. It only requires appropriate drive units.
Obviously the term "loading" of a driver has caused great confusion for you, as you apparently have your own definition of what loading is and by what method that is provided. Again, we have only claimed that the horn will operate as a point source over its intended range, which is limited by the angle and dimension of the flare. Above you state that ultra high frequency operation is "not possible with the devices you currently use in the Unity design." True, and we never said it could, but we said that the patented design can be continued on the small end if we had suitable drive units. YOU are the only one who limited possibilities to a 1" compression driver. A true conical shape would continue down to an infinitely small point. Our high frequency limit is only dictated by how close to this ideal we can get, and finding suitable drive units(there are other possibilities beyond conventional compression drivers. As an example, there is no reason that a Unity Aperture design could not be done with say 4 midranges, with another 4 high frequency drivers loaded closer to the apex than the midranges, and the flare continued on to an apex of 0.25" or smaller if desired. So long as the distances are kept acoustically small, this holds true.
To better suit your own definitions, maybe it would be more clear to think of the unity design as achieving operation as a single source within the bandwidth dictated by the dimensions and angle of the horn. The dimensions of the apex and the mouth dictate the range which the constructed flare presents a load to the drivers. Each set of drive units see an acoustic load within their operating passband. If a 5'x5' mouth flare was constructed, we could easily provide loading to 4 to 6 segments with proper drive units. The patent is not tied to any specific drive unit, only an acoustic device with appropriate parameters.
If there is one thing Tom Danley doesn't do is exaggerate. Usually he is overly modest and conservative in the claims of what his creations and ideas are capable of.
Mark Seaton
Sound Physics Labs / ServoDrive
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Follow Ups
- Re: horn stuff and final conclusions - Mark Seaton 07/16/0216:36:58 07/16/02 (1)
- Re: horn stuff and final conclusions - Wayne Parham 17:28:52 07/16/02 (0)
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