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The Crown® CM-31 is a professionalquality, supercardioid condenser microphone designed for inconspicuous mikingof a choir, orchestra or stage. It can also hang over conference tables or discussion groups for inconspicuous isolated miking. The CM-31 consists of two parts: the microphone with a permanently attached 30-foot (9.15-m) cable and the cylindrical electronics power module. The mic cable connects to the power module, which adapts the microphone for phantom powering and includes a low-cut switch. Cable connection is via miniature 3-pin connectors. The power module output is balanced, low impedance. It is protected against static and radio-frequency interference. The CM-31 has a smooth, wide-range frequency response for natural reproduction of the singing voice, organ or other musical instruments. Extreme low frequencies are filtered out to reduce pickup of room rumble. The microphone has a built-in removable hanger which allows easy position adjustment. The CM-31 microphone and cable are black; the CM-31W microphone and cable are white. Features: - Ideal for picking up choirs
- Supercardioid polar pattern aids gain-beforefeedbackand rejects background noise
- Small and inconspicuous
- Hanger allows position adjustment
- XLR connector with built-in electronics
Specifications: - Type: Unidirectional condenser.
- Transducer: Electret condenser.
- Frequency Response (typical): 40 Hz to 20,000 Hz.
- Polar Pattern: Supercardioid.
- Impedance: 150 ohms, balanced. Recommended minimum load impedance 1000 ohms.
- Open Circuit Sensitivity: 10 mV/Pa* (–40 dB re 1 volt/Pa).
- Power Sensitivity: –37.5 dB re 1 mW/Pa.
- Equivalent Noise Level: 28 dB SPL typical (0 dB = .0002 dyne/cm2), A-weighted.
- S/N Ratio: 66 dB at 94 dB SPL.
- Maximum Sound Pressure Level: 120 dB SPL produces 3% THD.
- Mic-Cable Connector: TA3F (mini XLR-type).
- Power Module Connector (input): TB3M (mini XLRtype).
- Power Module Connector (output): 3-pin male XLRtype.
- Power Module Switch: Flat/low-cut.
- Operating Voltage: Phantom power, 12 to 48 volts DC, positive voltage on pins 2 and 3 with respect topin 1 of output connector.
- Materials: Brass housing, steel power module housing.
- Finish: Black (CM-31) or white (CM-31W).
- Weight (microphone and cable): 4 ounces (113 grams).
- Weight (microphone, cable and power module): 9.5 ounces (269 grams).
- Cable: Black (CM-31) or white (CM-31W), 30' (9.15-m) 2-conductor shielded 0.1" (.254-cm) diametercable from microphone to electronics; none supplied for electronics output. Use 2-conductorshielded microphone cable.
- Included Accessories: WS5 black foam windscreen for CM-31, WS5W white foam windscreen forCM-31W.
- Optional Accessories: Crown PH-1A phantom power supply (1 channel, battery or AC adaptor powered).
*: 1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.
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Hanging Microphones 
