Wayne Parham Messages: 18875 Registered: January 2001
Illuminati (33rd Degree)
That's exactly right. It's like a reverse parallax, in that the listener receives sound from many points across the area of the throat. The distances and wavelengths involved cause destructive interference around 1.8kHz. This is a welcome rolloff though, since the horn was designed to be used to 1.6kHz.
Also right that the throat is a 4" square hole cut in the baffle board.
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