How do we tell the difference as the above shows one snapshot per frequency? (or is the point something else)
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The purpose is to show that a step in the horn generates modes and what modal coupling looks like.
drivers are linear...?? yeah, ok if you say so.
if distortion is not a function of level how does one prevent it's occurrence?
although i disagree about diffraction's nature i fully agree it's perception is cause for misunderstanding
Here is another source with respect to loading from Prof. W. Reichardt "Grundlagen der Elektroakustik", 3. Auflage.
It is like fake news to deny that the exponential horn has no better loading than the conical horn and that loading effects does not play any role:
All examples have the same thraot, length and mouth. For n -> infinity (exponential horn) has the best - in german - Wirk- und Blindwiderstand.
It is like fake news to deny that the exponential horn has no better loading than the conical horn and that loading effects does not play any role:
All examples have the same thraot, length and mouth. For n -> infinity (exponential horn) has the best - in german - Wirk- und Blindwiderstand.
Ask Tom Danley which one has better loading characteristics. For his usual purposes, conical is better.
Of that I am not certain.
Honestly, I think it's the other way around.
Conical: best directivity characteristics at the price of poor loading.
Why does Danley mount multiple compression drivers in the Jerichos?
Exactly, in order to keep up with the (mid and low) woofers.
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Guys, correct me for sure....
but I thought the overriding reason Danley uses a conical horn is for the decreasing flare rate it provides moving from throat to mouth. That allows proper loading for drivers/frequencies as they enter the horn.
Maybe I don't understand the patent or what "loading" means, but it sure seems like horn loading is a huge design element. US6411718B1 - Sound reproduction employing unity summation aperture loudspeakers
- Google Patents
but I thought the overriding reason Danley uses a conical horn is for the decreasing flare rate it provides moving from throat to mouth. That allows proper loading for drivers/frequencies as they enter the horn.
Maybe I don't understand the patent or what "loading" means, but it sure seems like horn loading is a huge design element. US6411718B1 - Sound reproduction employing unity summation aperture loudspeakers
- Google Patents
This is what the Horn Doctor says:
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No, it's indicating that the compression driver is better behaved and contributing less of its own sound in a deep horn. That's a good thing.
You are 100% correct. That is what I was referring to in my post. the 64 CDs of the J64 are there to compensate for the HF attenuation in air in the ludicrously long throw applications (stadium) that J64 was designed for.
The J3-64's coverage pattern is 60° H and 40° V for a max. output of 149 dB SPL. There are 18 drivers in the horn. Six 15” woofers, eight 6.5” mids and four 1.4” highs.
The one with 64 B&C 1" comp. drivers is the J4-31, capable of 153 dB SPL, albeit with a very narrow 30 x 10° coverage pattern.
The specified operating frequency range is 600 Hz - 12 KHz with a recommend high pass at 3KHz.
At home, where 120 dB suffices for most of us, the same driver/throat section with a 90 x 60° mouth would probably allow 400-20k.
You'd still have to spend about $7-8000 on drivers though, for 1 cab. With Polyimide diaphrams instead of Titanium, it may sound decent.
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Yep, it's a stunning piece of engineering. Perhaps a benchmark large format monitor loudspeaker.
I was invited by the manufacturer for a demo, which I'll happily reconsider, if I am in the neighbourhood.
I was invited by the manufacturer for a demo, which I'll happily reconsider, if I am in the neighbourhood.
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The J4-31 is a high frequency horn with 64 compression drivers. It's nutz. Like a high frequency flashlight/searchlight. Not quite a laser beam, but it feels like it.
If we assume that the conical horn is axisymmetric, then the "flare rate" (by definition - the rate at which the radius changes) will be constant. The rate at which the cross-sectional area (Pi x radius ^ 2) changes will increase (not decrease) moving from throat to mouth.