The Crown CM-30 is a professional quality, 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. Operating Instructions The CM-30 consists of the microphone, attached 30-ft (9.5-m) cable, and associated electronics. The electronics PC board is mounted to the rectangular electrical plate (provided) as shown in Fig. 4. The mating electrical backbox should be installed at the mounting location. Input and output screw terminals eliminate the need for cable connectors. The provided strain relief acts as a cable clamp when securely tightened. Recommended microphone placement for sound reinforcement is shown in Figs. 5a and 5b. For recording or broadcast, you might want to place the microphone a few feet farther away to pick up more room acoustics. Bend the wire hanger to achieve the desired pickup angle.

Crown CM30 Features
• Ideal for picking up choirs
• Supercardioid polar pattern aids gain-beforefeedback
and rejects background noise
• Small and inconspicuous
• Hanger allows position adjustment
• Electronics mount in a standard electrical
outlet box

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).
*1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.