Quote:
Originally Posted by
dgpretzel
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It just hadn't occurred to me to use boundary mics for choir behind an orchestra. Sounds like a great way to get smooth, wide coverage with the mics, while also drastically reducing bleed from the orchestra.
I have four 4060/1 DPA mics, with the boundary mounts that comes with their kits. If I want to mount them vertically, attached to plexiglass, between the orchestra and choir, how large a sheet of plexiglass (for each mic) would be required?
Thank you.
DG
Depends entirely on how low a frequency you want them to remain directional.
For instance, the Neumann GFM132 becomes fully omni at about 400Hz (see below). If one made a copy of the GFM plate but increased the size so that the longest side were doubled, that freq would drop to 200Hz. I would think that a transition to omni at 400 would be fine for choir spots.
The larger the boundary, the lower the freq at which this occurs. Below is also the formula published by Crown for determining size vs freq.
The attached Neumann research paper is worth a read.