<<Looks like a standard triple boundary doubled / corner reflector aka the =
pyramid:) - known art. >>
Quite so, which means as an existing concept it is not patentable, at least=
not according to patent law in the United States.
In the early 1980s I toured with an ethnic dance ensemble, mixing their sou=
nd for concert tours. The dancers were also the choir, singing during vario=
us numbers. The engineer I took over from used to hang mics over the stage,=
which to my mind was an unsightly theatrical presentation, as well as unwo=
rkable on certain (mostly outdoor) stages with no overhead rigging. My solu=
tion was to make folding plexiglass boundaries, about 10 inches high by 18 =
inches wide, with a clear tape hinge holding two panes together on the 10" =
side. With an 1/8th" x 3" slot cut along the bottom at the taped edges, a C=
rown PZM was placed at the apex with the capsule nearly touching the plexig=
lass. Three of these across the front of the stage, with the wings opened t=
o 90 degrees, provided excellent approximately cardioid pickup of the choir=
voices, while remaining mostly invisible to the audience.
Two of these units back to back I imagine would be a Brinibox, although for=
live concert use we weren't interested in stereo. With the introduction of=
the Crown PCC160 directional boundary mic my PZM boundary shields became s=
uperfluous.
Scott Fraser
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