As you know Wayne, I have purchased some Altec 811b horns for the 4pi Theatres I am building. In searching through the Pi Forum archives I found where you had posted this:
"The PSD2002 sounds excellent on the Altec 811 with the same crossover used in the Theater four π speaker. You can really consider the whole kit to be a good second source to Altec components for the Model 19 loudspeaker, but swap the polarity of the HF driver."
Wayne Parham Messages: 18787 Registered: January 2001
Illuminati (33rd Degree)
The 811 is a longer horn and it moves the driver into a position where there is destructive interference in the crossover range. By swapping polarity, you can maintain acceptable summing.
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