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Changing the mic position changes the ratio of lows
to highs. Adjust the position for the sound you
prefer.
If you hear breath pops when using the mic, it is too
close to your mouth. Loosen the thumbscrew and
move the mic farther to the side of your mouth until
you no longer hear pops. Since the mic is very "hot",
the level loss should not be a problem.
If the mic sounds nasal or pinched, it is too close to
your mouth, and is not picking up sounds from your
nose. Loosen the thumbscrew and move the mic
farther to the side of your mouth until it sounds
natural (Fig. 5). Or angle the mic to aim more toward
your nose.
4. Tighten the thumbscrew.
Fig. 5
Typical mic position at one
side of the mouth. If you hear
breath pops or a nasal sound,
move mic sideways away from
mouth.
Fig. 6
Dimensions
3"
5.75"
Fig.7
Dimensions
1.062"
(2.7 cm)
2.593"
(6.6 cm)
Operation
1. Access the battery by sliding open the battery
cover.
2. Insert a fresh 9V alkaline battery (Mallory Duracell
MN9100 or equivalent) into the battery tray. The
battery cover shows the correct polarity.
3. Replace the battery cover.
Connect the belt pack to the mixer using a 2-conduc-
tor shielded mic cable with XLR-type connectors. If
your mixer lacks phantom power, either turn on the
battery switch on the belt pack, or use a separate
phantom-power supply (such as the Crown PH-1A or
PH-4B).
If you're using phantom power and the battery
switch is on, the battery will automatically take over if
phantom power fails. Turn off the battery switch
when not in use to prolong battery life.
After 110 hours of use, or if the sound is distorted,
it's time to replace the battery.
The mic is not shock mounted because a shock
mount would add undesirable size and weight. If you
clip the cable to your clothing to prevent cable
rubbing, you should hear no handling noise.
If the mic is too "hot" or sensitive, you can reduce its
output level by adding a resistor across output
connector pins 2 and 3. Use 200 ohms for 6 dB
loss. Use 65 ohms for 12 dB loss.
How to program the mic on/off switch
The mic on/off switch can be programmed to work in
three ways:
Push-on/push-off (as supplied).
Momentary on (push to talk).
Momentary off (cough button).
To change the switch operation, open the belt-pack case
by removing the three screws. Set the switch as shown
below:
TO XLR
PUSH ON/
PUSH OFF
The LED lights when the mic is on.
Architects' and Engineers' Specifications
The microphone shall be the Crown Model
2"
CM-312AHS. The microphone shall be a headworn
hypercardioid type of electret-condenser design. The
microphone shall exhibit excellent off-axis response
and gain-before-feedback. The microphone shall have
an adjustable boom with a locking thumbscrew and a
foam pop filter. The microphone shall mount onto
either earpiece of a Sony MDR-7506 or MDR-V6
headphone.
A 4-foot, permanently attached, two-conductor
shielded cable shall connect the microphone to the
belt pack. The belt pack shall include a 3-pin pro
audio (XLR type) connector, battery on/off switch, a
programmable mic on/off switch, and a "Mic On"
LED. The microphone shall be powered by a 9V
battery in the belt pack, or by 18 to 48V phantom
3.745"
power.
(9.5 cm)
Nominal open-circuit sensitivity shall be 4 mV/Pa.
Maximum SPL shall be 148 dB SPL for 3% THD.
Equivalent noise shall be 31 dBA nominal. Frequency
response shall be 50 Hz to 17,000 Hz with a uniform
.680"
off-axis response, over 20 dB down at the rear nulls.
(1.7 cm)
The Crown model CM-312AHS is specified.
Warranty
Crown professional microphones are guaranteed
against malfunction for a period of three years from
date of original purchase. Please refer to the enclosed
full warranty statement for more detail.
Service
If the microphone does not function properly, check
that it is aimed correctly and is connected as de-
scribed in this data sheet. If the microphone is
defective, return it in the original packaging to Crown
Factory Service, 1718 West Mishawaka Road, Elkhart,
IN 46517. For further assistance or technical support
call 800-342-6939.
MOM OFF
MOM. ON
(COUGH)
(P.T.T.)
©
2003 Crown Audio, Inc.
Specifications subject to change without prior notice.
Latest information available at www.crownaudio.com.
Crown is a registered trademark of Crown International.
10/03
CM-312AHS
Crown International, Inc.
P . O. Box 1000
Elkhart, IN 46515-1000
TEL: 574-294-8000
FAX: 574-294-8FAX
www.crownaudio.com
102549-2
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