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In Reply to: Re: horn stuff and final conclusions posted by tomservo on July 15, 2002 at 09:31:27:
Hello Tom!You wrote:
>> Again, your assertion that the horn has something to do with hf
>> limitations is getting old. I am grateful the air molecules know
>> nothing about what you speak of. If they did know, then the
>> device described in patent 4,841,495 would not have worked or
>> solved the problem it did. Fortunately, it did work and while the
>> highest operating frequency I tried was 48 KHz , I did make
>> prototypes at 16, 21, 35 and 45 KHz). While not 2.5 KHz, it WAS a
>> conical horn and driver I also designed which operated as intended
>> well more than 4 Octaves higher.A much smaller device, appropriate for the frequency, no doubt.
At 48Khz, I would imagine its throat was no larger than 1/4", and better to be 1/8" or smaller.
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."
>> Even the change in time inherent in the compression driver
>> could be "fixed" with an all pass filter of the right delay
>> (equal to about 2 1/2 inches in air). That step is not worth
>> the extra cost of the parts in Pro sound, however it can be
>> done and then the rise in phase seen above 3 KHz is gone.I agree that it's not worth it.
But this is the point - The top decade isn't time aligned and neither are the bottom octaves, where the woofer is running. The system is optimized for the midrange band, which is something that other systems can claim as well. Your Unity system is a novel idea, and may provide some benefits. But it is not a point source.
[ about my statement, "I saw the graphs on your website before you took them down last week." ]
>> What graphs are you talking about?????
I saw Unity performance data on your website at www.ServoDrive.com. Later, I went to look for something that you referenced in one of your posts and found the website was offline and the response graphs were gone. Instead, the site says "This site is currently being overhauled. Please check back soon!"
It still says that as the time of this writing.
>> I have asked Brad (the president of the company) this morning
>> about "what was removed" from the web site but so far as he
>> knows, nothing was removed in fact there is backlog of stuff
>> to add.Better check with the web guys. Click the Servorive.com link and see what I mean.
Take care!
Wayne Parham
π Speakers
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Follow Ups
- Re: horn stuff and final conclusions - Wayne Parham 16:33:51 07/15/02 (4)
- Re: horn stuff and final conclusions - Mark Seaton 16:36:58 07/16/02 (1)
- Re: horn stuff and final conclusions - Wayne Parham 17:28:52 07/16/02 (0)
- Re: horn stuff and final conclusions - tomservo 18:15:21 07/15/02 (1)
- Re: horn stuff and final conclusions - Wayne Parham 15:31:16 07/16/02 (0)
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