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Crown CM31 Microphone The Crown CM-31 is a professionalquality, supercardioid condenser microphone designed for inconspicuous miking of 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. 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 to pin 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) diameter cable from microphone to electronics; none supplied for electronics output. Use 2-conductor shielded microphone cable. Dimensions: See Fig. 5 on reverse side. Included Accessories: WS5 black foam windscreen for CM-31, WS5W white foam windscreen for CM-31W. Optional Accessories: Crown PH-1A phantom power supply (1 channel, battery or AC adaptor powered), Crown PH-4B phantom power supply (4 channels, AC powered). *1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.
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