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Old 19th June 2013, 11:09 AM   #71
JLH is offline JLH  United States
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Quote:
Originally Posted by bear View Post
Imo, that would depend on a few things.

What frequencies?

Is there any diffraction or other diffraction causing discontinuity at or near the throat?

Why do the JMMC horns (even ones like 200Hz horns) show a smoother response with very large "lips" at high frequencies if there is no effect at the mouth?

_-_-
You're trying to compare apples to oranges. The JMMC horns use a single compression driver across a broad bandwidth. The Synergy horns use multiple drivers with a specific crossover that limits the acoustic image of each driver. This segregation of frequencies prevent the high frequency output from the compression driver from acoustically seeing, or riding along the horn wall once the horn circumference has reached a certain cross sectional area.
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Old 20th June 2013, 10:11 PM   #72
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Originally Posted by bear View Post
I agree it is difficult to understand the relationships and the pros and cons of the various horn and waveguide designs.

For example, the L'Cleach designs show how a big turned back mouth lip smooths response, yet with the typical conical horn there is an abrupt transition out to the world at the end of the mouth with no rounding.

Shooting from the hip now, I seem to recall that Webster's equations for the exponential expansion gave even loading (I so do not want to use the word "constant") to the diaphragm, the others do not. This was seen as an important design goal, so most horn designs for decades followed this idea.

_-_-bear
The expansion of a conical horn is very rapid close to its apex (throat) doubling its expansion in a very short distance (as an exponential horn would). As the distance from the apex is increased the *expansion rate* essentially decreases ~ it takes a longer and longer distance down the horn from any given point in the horn for the area to double. In essence, for every point along the axis of a conical horn there is a different expansion rate, and in turn, a different cut-off frequency. By utilizing this effect a conical horn can be driven at the appropriate place along its length to yield good low frequency loading of the driver. Therefore the lower frequency drivers are placed closer to the mouth of the horn, where the horn provides better loading within the frequency region (pass band) where the drivers will be used.

From Danley Sound Labs White Paper on Tapped Horn and Synergy Horn Technologies
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