Some months ago, I managed to construct a modified(simplified) Zwislocki coupler:
entirely out of a pulp material and later finished w/ resin.
[for 0.3" microphones only]
Still its accuracy was little off from IEC-711 due to the acoustic impedance mismatch in the mid frequency range. I need to further enhance the design.
Where can we find more details on a Zwislocki coupler? a model or a schematic / paper with the design...
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