Crown Audio Microphone CM 312AE User Manual

POLAR  
PATTERN  
HYPERCARDIOID HEADWORN  
CONDENSER MICROPHONE  
CM-312AE  
Fig. 1  
Frequency Response  
+15  
+10  
+5  
0°, 1.375 in.  
he Crown® CM-312AE is a rugged, lightweight  
headworn microphone designed for aerobics,  
live entertainment, and sports broadcasting. It is  
0
dB  
-5  
-10  
-15  
-20  
-25  
-30  
-35  
T
0°, 2 ft.  
120°, 2 ft.  
intended for wireless-mic applications that require a  
light, inconspicuous mic.  
The CM-312AE has no connector; you solder on a  
connector that mates with a wireless transmitter of  
your choice. Technical Bulletin #3 (included) shows  
the correct wiring for various transmitters.  
20  
100  
1K  
Frequency in Hz  
10K 20K  
Because the microphone is to the side of the mouth,  
breath pops are eliminated. The sound of the  
CM-312AE can be tailored to taste by moving the  
microphone closer or farther from the corner of the  
mouth.  
Fig. 2  
Polar Response  
Specifications  
Transducer type: Electret condenser.  
330°  
0°  
30°  
FRONT  
Frequency response (typical): 50 Hz to 17,000 Hz (see  
Fig. 1).  
The CM-312AE sounds like the best handheld mi-  
crophones. Its hypercardioid pickup pattern reduces  
feedback and aids isolation. In difficult situations, the  
Crown CM-311AE headworn mic is recommended  
because it picks up even less feedback and leakage  
than the CM-312AE.  
-0  
-5  
300°  
270°  
60°  
90°  
Polar pattern: Hypercardioid (see Fig. 2).  
Impedance: 6 kilohms unbalanced.  
-10  
-15  
-20  
Recommended load impedance: 10 kilohms.  
Open-circuit sensitivity, typical, close-talking:  
2.9 mV/Pa* (–51 dB re 1V/Pa*).  
Designed for comfort, the headband fits behind the  
head and disappears in use. Both the headband and  
boom adjust to fit any head. Because of the boom’s  
unique behind-the-ear design, it does not cover up the  
user’s face.  
Power sensitivity, typical, close-talking:  
–65 dB re 1 mW/Pa*.  
Equivalent noise level (self noise): 31 dB SPL typical  
120°  
240°  
1000 Hz  
300 Hz  
6000 Hz  
(0 dB = 0.0002 dyne/cm2), A-weighted.  
S/N ratio: 63 dB at 94 dB SPL.  
REAR  
180°  
How to adjust for best fit  
Maximum SPL: 148 dB SPL produces 3% THD.  
Operating voltage: 3–9V DC from the transmitter’s battery.  
210°  
150°  
For best results, the CM-312AE MUST be custom fit-  
ted to one wearer’s head. This simple procedure takes  
only a few minutes. Please refer to Fig. 3 and locate  
the parts described.  
Polarity: Positive pressure on diaphragm produces posi-  
tive voltage on white lead with respect to shield.  
Current drain: 0.27 mA nominal.  
Fig. 3 Parts  
1. If the microphone is for yourself, we suggest that  
you use a mirror to double check the fit as you make  
adjustments.  
Battery life: Approximately equal to transmitter battery  
life.  
EARPIECE  
Operating temperature range: –18° to +57° C, or 0° to  
+135° F.  
2. Loosen (just a little) the thumbscrew located on the  
outside of the foam block, part way back on the boom.  
This allows the boom to slide in and out, and to rotate  
left and right.  
HEADBAND  
WIRE  
Off-attenuation: 70 dB @ 1kHz.  
Output connectors: Supply your own to match your  
transmitter.  
Cable: 45-inches long (1.14-m), 2-conductor shielded  
unbalanced cable, unterminated. In-line with this cable  
is a small circuit module that equalizes the microphone  
signal. White lead is audio, red lead is DC bias, and  
shield is ground.  
FOAM BLOCK  
WIRE  
3. Now adjust the headband to fit your head. Put the  
foam block wire behind your ear.  
MIC  
BOOM  
FOAM BLOCK  
Start bending the headband wire from the boom  
side, moving around to the other ear. The back of the  
headband should fit firmly against the back of the  
neck. If you can slide a finger between the headband  
and the back of your neck, then the headband is not  
fitted correctly. For users with smaller or petite heads,  
you may have to re-bend the earpiece around the ear,  
and cut off extra headband material.  
Materials: High-impact plastic and PVC mic housing,  
brass boom, steel wire headband.  
THUMBSCREW  
DETAIL  
Finish: Satin black.  
Net weight: 1.5 oz (43 g).  
TO MOVE MIC  
Dimensions: Headband 5.5 in. (13.97 cm) diameter,  
adjustable. Boom approximately 5.75 in. (14.61 cm).  
See Fig. 6.  
UP OR DOWN  
4. Next, adjust the foam pad snug against your head  
or neck. To do this, bend the wire that goes into the  
foam block. CAUTION! Do not bend the boom itself  
– just the foam-block wire. A snug fit of the foam pad  
prevents boom bounce when you move around.  
Included accessories: Microphone carrying case, WS-7  
foam pop filter and clothing clip for aerobics.  
TO MOVE MIC  
IN OR OUT  
*1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL.  
TO MOVE MIC  
LEFT OR RIGHT  
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