Posted by Wayne Parham [ 67.66.230.135 ] on June 19, 2005 at 09:27:47:
In Reply to: HF Compression driver without horn flare? posted by Paul Holland on June 19, 2005 at 06:13:56:
A compression driver used without a horn is basically a dome midrange/tweeter. The TAD 4001 has a beryllium 4" diaphragm, a 5 slit phase plug and a 2" diameter throat. Do you know if Deep Audio removes the cover and phase plug and radiates off the diaphragm side, or do they leave the plug installed and output through the throat when using the device as a direct radiator?
As for models of π Speakers, there are three basic types.
The one π and two π speakers have a direct radiating cone woofer and dome tweeter. The tweeter is designed with a wide surround and is capable of relatively high excursion, making a first-order crossover possible. The woofer becomes increasingly directional as frequency goes up, but the crossover range is very wide because of the use of a first-order crossover. So there isn't an abrupt change in directionality due to the fact that the woofer and tweeter share a wide common band.
Three π and four π loudspeakers use DI matching between the cone woofer and horn loaded tweeter. Crossover is done where the woofer directionality narrows to match that of the horn tweeter. This prevents a sudden change in in directionality because the woofer and tweeter are about the same at the crossover point.
The five, six and seven π loudspeakers use the room's corner to confine woofer radiation to the 90° wall angle. This is matched by the midrange and tweeter directionality, since both also use 90° flares.
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