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RE: Another First Reflection Trap (FRT) Adventure : Quasi-Ambiophonics

Posted by MG-bert on March 13, 2017 at 09:25:53:
Ralph:

I've been meaning to comment on what appears to be an error (typo?) in your free on-line Ambio book. In Chapter 8, there is a section on Ambiodipoles which features an equation for determining how far one can sit away from a central barrier per the 1986 AES paper by Timothy Bock and Don Keele Jr. I remember finding an error in their resulting equation; there definitely is in the equation you state, namely L=X(H+T)�D.

My derivation, using all the terms as defined in your Ambio book, is

L = X(H+T)/(D-T)

If you need it, I could send you my derivation. BTW, I'm a structural engineer, so this kind of geometric exercise is part of my professional skill set.

�