High Efficiency Speaker Asylum

Perfect.

210.49.212.82

In Reply to: RE: Most of that made sense :-) posted by Paul Eizik on June 11, 2008 at 19:17:56

Thanks very much for this excellent explanation.

"Higher frequencies [...] will be too small to be affected by the horn mouth"

This beaming is why ripple is pronounced at the cutoff frequency, rather than up high. Those Linkwitz graphs also show this beaming vs ripple effect very nicely.

"A horn by contrast (even an infinite exponential horn) has an increasing expansion proceeding from the driver along the axis to the mouth of the horn (or infinity as it were), so it presents an asymmetrical load to the driver, which changes as the wave propagates along the horn depending on the wavelength"

Agreed, the load changes (gradually) as the wave propogates down the horn.

My idea is that, in a finite horn, there comes a point where the loading changes (suddenly) at the mouth-->free air interface. Which is why horns (with undersized mouths, or that are run too low) have some ripple. It seems to me that, if reducing this ripple can be done by:

-->increasing the mouth size
-->raising the crossover point
-->making the mouth rectangular

...the last option is the closest one to a free lunch.

The logic works enough so that I'm cutting rectangular baffles for the mouth of the horn I posted earlier :-)

Follow Ups:

RE: Perfect? - Paul Eizik 10:21:44 06/12/08 (0)
RE: Perfect. - Paul Joppa 22:22:56 06/11/08 (0)

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