This is more a general PZM question, than specific to a particular model. I'm looking for a way to determine LF response (or cut-off) as a function of boundary size.
I've been asked to assemble a "stereo microphone" for recording the church choir, and been handed a pair of original-issue (licensed from Crown) Radio-Shack PZM microphones (model 33-1090). Please don't laugh...
Researching the topic, I find they have some respect in the amateur recording world... which is right where the choir lives (serious amateurs).
OK. So I plan to mounting them on opposite sides of a plexiglass sheet, to get a nice spherical pickup pattern, and everybody's happy.
The question is (...finally, The Question), what are the critical dimensions for achieving "good" LF response from this configuration. At times the pipe organ accompanies the voices, so "full range" would be good to have.
If anyone can relate boundary area to LF extension, I'd really appreciate it.