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Crown CM30 Microphone The Crown CM-30 is a professionalquality, supercardioid condenser microphone designed for inconspicuous miking of a choir, orchestra or stage. The mic cable connects to the electronics/faceplate which fits a standard electrical outlet box. The CM-30 can also hang over conference tables or discussion groups for inconspicuous isolated miking. Because of its supercardioid pickup pattern, the CM-30 rejects background noise and room reverberation, and improves gain-before-feedback more than a cardioid microphone. The CM-30 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 output is balanced, low impedance. It is protected against static and radio frequency interference. A built-in removable hanger allows easy position adjustment by bending the lower portion of the hanger. The CM-30 requires 12-48V phantom power. The CM-30 is black; the CM-30W is white. Specifications: Type: Unidirectional condenser. Transducer: Electret condenser. Frequency Response (typical): 40 Hz to 20,000 Hz. See Fig. 1. Polar Pattern: Supercardioid (see Fig. 2). 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 = 0.0002 dyne/cm2), A-weighted. S/N Ratio: 66 dB at 94 dB SPL. Maximum Sound Pressure Level: 120 dB SPL produces 3% THD. Input Connectors: Screw terminals. Output Connectors: Screw terminals. Operating Voltage: Phantom power, 12 to 48 volts DC, positive voltage on pins 2 and 3 with respect to pin 1 of output terminal. Current drain: 4.5 milliamperes. Materials: Brass housing, steel faceplate. Finish: Black (CM-30) or white (CM-30W) microphone, white faceplate. Weight (microphone and cable): 4 ounces (113 grams). Weight (microphone, cable and circuit): 7.5 ounces (212 grams). Cable: Black (CM-30) or white (CM-30W), 30-ft (9.15-m) 2-conductor shielded 0.1-in. (0.254-cm) diameter cable from microphone to electronics; none supplied for electronics output. Use 2-conductor shielded microphone cable. Dimensions: See Fig. 3 on reverse side. Included Accessories: WS-5 windscreen (black or white). 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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