Posted by Earl Geddes [ 69.209.132.100 ] on December 22, 2005 at 13:36:27:
In Reply to: Angular coverage defined posted by Wayne Parham on December 22, 2005 at 11:53:00:
Wayne,you are twisting the deffinition to suite your purposes.
To wit see Beranek, Acoustics, sec XI. The DI is not defined for a "corner" it is only defined for a "source of sound".
The 9 dB comes from only defining the sound field for a 1/8 space and using full space as a reference - not very meaningful. ANY source in that space would thus have a minimum of 9 dB of DI, making the value meaningless. Even an omni-directional source would have a DI of 9 dB by this deffinition.
The 9 dB is simply an artifact of the boundary conditions in an unrealistic situation where there is only ONE corner. Klipsch actually built a chamber like this in Hope, but I know of no other. They did it because it was the only way to test corner horns.
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