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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: RE: Can It Be a Horn If It Doesn't Look Like One? posted by Larry I on November 6, 2024 at 12:07:05:
The term "waveguide" was borrowed from the microwave area and came in to use when the constant directivity horns were first developed. These were needed for use when there is an audience listening vs a listener.
Horns can increase the efficiency by coupling more of the radiation impedance to the cone.
Horns can also appear to increase the efficiency by confining the radiation to a smaller angle so what one measures is normally the product of both things.
These two points both have a rule of thumb; for the impedance transformation, this stops at a frequency related to the horn passages circumference. This is why in the old days, people would say a 30Hz horn has to be 10 feet in diameter which is the point where the transformation stops BUT it doesn't mean the horn won't work if smaller.
On the other hand the expansion rate has a "high pass" corner in this transformation, for example a 30Hz exponential horn can't expand any faster than doubling it's area every 2 feet or so.
On the other other hand, the point that the horn stops controlling the radiation angle is approximately 10^6 / horn angle / / horn mouth dimension (inches) as cited by don Keele.
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Follow Ups
- RE: Can It Be a Horn If It Doesn't Look Like One? - tomservo 05:54:34 11/09/24 (0)
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