Posted by Wayne Parham [ 70.128.100.240 ] on August 19, 2006 at 11:14:09:

In Reply to: Re: Alpha 10 for midhorn? posted by Chris R on August 19, 2006 at 10:51:13:

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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