Sony ECM 22P Pair Cardioid Condenser Mics (Vintage)
Circa 1972. The Sony microphone Model ECM-22P is a cardioid condenser type with uniform response from 40 to 15,000 Hz. The capsule is 17 mm in diameter and made of a high-polymer film utilizing the electret principle of polarization and two output impedances: 250 or 600 ohms can be selected by changing the impedance switch. The ECM-22P can be operated on an external DC power supply without any additional conductors or cables, besides battery operation.
Multiple “voicings”, basically a filter set for “M”usic or “V”oice, with bass roll-offs.
- Type: Electret condenser microphone
- Battery: Eveready No. 206 dry cell (9 V), No. E-126 mercury cell (8.4 V), or equivalent
- Power Supply: Nominal operating voltage: 8.4 V
Minimum operating voltage: 3.7 V
(Acceptable external power supply of DC 4.5 to 54 V)
Current drain: approximately 600 µA
Battery life: more than 1,000 hours with E-126
more than 500 hours with E-206 - Frequency Response: 40 to 15,000 Hz
- Directivity: uni-directional (cardioid)
- Output Impedance: 250 ohms or 600 ohms at 1 kHz balanced
- Noise Level: S/N ratio: 64 dB (1 kHz, 10 µbar)
Inherent noise: less than 30 dB-SPL - Maximum Sound Pressure Input Level: 124 dB-SPL