Crown PZM-30GP (c. 1983)
Little is documented about the Crown PZM-30GP beyond a single period equipment profile. The record shows a pressure-zone microphone - a pressure-calibrated electret condenser with a hemispherical pickup pattern, rated at 50 Hz to 15 kHz. Audio (March 1983, p.50) ran the profile. The same review noted that Crown carefully tested and selected the electret capsules to meet the PZM line's rigid performance specifications, and that this showed in a relatively high selling price (p.51).
Power came from Crown's PA-18B or PX-18B supplies, which ran on two internal 9 V batteries (MN1604) or external phantom power of 15 to 48 V DC. The review's diagrams also reference a PZM-30GPG wired for direct 9 V operation. Beyond that, surviving information is thin. No service literature, production dates, or original pricing details have surfaced in the archive.
Known specs from the Audio profile:
- Active element: pressure-calibrated electret condenser
- Polar pattern: hemispherical
- Frequency response: 50 Hz – 15 kHz
- Power: PA-18B or PX-18B supply; two internal 9 V batteries (MN1604) or external phantom 15–48 V DC
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