Crown Audio Microphone CM 30 User Manual

POLAR  
PATTERN  
MINIATURE SUPERCARDIOID  
CONDENSER MICROPHONE  
CM-30  
CM-30W  
he Crown® CM-30 is a professional-  
quality, supercardioid condenser micro-  
phone designed for inconspicuous miking  
T
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.  
Features  
• Small and inconspicuous  
• Hanger allows position adjustment  
• Electronics mount in a standard electrical  
outlet box  
• Ideal for picking up choirs  
• Supercardioid polar pattern aids gain-before-  
feedback and rejects background noise  
Because of its supercardioid pickup pattern, the  
CM-30 rejects background noise and room re-  
verberation, and improves gain-before-feedback  
more than a cardioid microphone.  
Specifications  
Type: Unidirectional condenser.  
Transducer: Electret condenser.  
Frequency Response (typical): 40 Hz to 20,000 Hz.  
See Fig. 1.  
The CM-30 has a smooth, wide-range  
Frequency Response  
Fig. 1  
frequency response for natural reproduction of  
the singing voice, organ or other musical instru-  
ments. Extreme low frequencies are filtered out  
to reduce pickup of room rumble.  
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.  
The microphone output is balanced, low imped-  
ance. It is protected against static and  
radio frequency interference. A built-in remov-  
able 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.  
Frequency in Hz  
Equivalent Noise Level: 28 dB SPL typical  
Operating Instructions  
(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) micro-  
phone, 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 electron-  
ics; none supplied for electronics output. Use  
2-conductor shielded microphone cable.  
The CM-30 consists of the microphone, at-  
tached 30-ft (9.5-m) cable, and associated elec-  
tronics. 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.  
Fig. 2  
Polar Response  
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.  
Architects’ and Engineers’ Specifications  
The microphone shall be the Crown CM-30. It  
shall be a professional-quality supercardioid  
condenser microphone designed for incon-  
spicuous miking of a choir or other large musi-  
cal ensembles. It shall be hung from the ceiling,  
where its cable shall connect to electronics  
installed in a standard electrical outlet box.  
Dimensions: See Fig. 3 on reverse side.  
Included Accessories: WS-5 windscreen (black or  
white).  
Frequency response shall be 40 Hz to 20,000  
Hz. Extreme low frequencies shall be filtered out  
to reduce pickup of room rumble. Open-circuit  
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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