Filter
Top Products
Crown International, Inc.
1718 W. Mishawaka Rd.
Elkhart, IN 46517-9439
TEL: 574-294-8000
FAX: 574-294-8FAX
www.crownaudio.com
CM-311AHS
©2005 Crown Audio
®
, Inc. Specifi cations subject to
change without prior notice. Latest information avail-
able at www.crownaudio.com. Crown, Crown Audio
and Differoid are registered trademarks of Crown
International.
7/05 102548-3A
TO XLR
MOM. ON
(
P.T.T.
)
PUSH ON/
PUSH OFF
MOM OFF
(
COUGH
)
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.
The LED lights when the mic is on.
The microphone shall have an adjustable boom
with a locking thumbscrew, a battery belt pack, a
foam pop fi lter, a 2-stage pop fi lter, and a wind-
screen. The microphone shall mount to either ear-
piece of a Sony MDR-7506 or MDR-V6 headphone.
A 4-foot, (1.219-m) 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, programmable mic on/off
switch, and “Mic On” LED. The microphone shall
be powered by a 9V battery in the belt pack, or by
18 to 48V phantom power.
Nominal open-circuit sensitivity shall be 4 mV/Pa.
Maximum SPL shall be 148 dB SPL for 3% THD.
Equivalent noise shall be 26 dBA nominal. Fre-
quency response shall be 50 Hz to 15,000 Hz with
a uniform off-axis response, over 20 dB down at
the rear null. The Crown model CM-311AHS is
specifi ed.
Warranty
Crown professional microphones are guaranteed
against malfunction for a period of three years
from date of original purchase. See enclosed war-
ranty sheet for additional information.
Service
If the microphone does not function properly,
check that it is aimed correctly and is connected
as described in this datasheet. If the microphone
is defective, return it in the original packaging to:
Crown Factory Service, 1718 West Mishawaka
Road, Elkhart, IN 46517-9439. For further assis-
tance or technical support call 800-342-6939.
Architects’ and Engineers’ Specifi cations
The microphone shall be the Crown Model
CM-311AHS or equivalent. The microphone shall
be a head-worn noise-cancelling, cardioid type of
electret-condenser design. The microphone shall
exhibit excellent off-axis response and gain-before-
feedback.
Frequency in Hz
REAR
FRONT
-20
-15
-10
-5
-0
60
90
120
150180
210
240
270
300
0
30
330
200 Hz
300 Hz-3 kHz
10 kHz
Fig. 3
Fig. 4
Fig. 5
7 in.
(17.78 cm)
3 in.
(7.62 cm)
3 in.
(7.62 cm)
THUMBSCREW
BLOCK
INNER HALF
PIN
BLOCK
OUTER HALF
Fig. 6
1. REMOVE POP FILTER FROM MIC.
2. SLIP FOAM TUBE OVER MIC.
3. ORIENT WINDSCREEN SO FLAT AREA WILL BE OVER
FRONT OF MIC. SLIP WINDSCREEN OVER FOAM TUBE
AND VELCRO STRAP.
4. GRAB THE WINDSCREEN’S OPEN END, AND
PINCH IT AROUND THE BOOM.
5. WRAP VELCRO STRAP TIGHTLY AROUND END OF
WINDSCREEN.
POP FILTER
MIC
MIC
FOAM TUBE
WINDSCREEN
VELCRO STRAP
BOOM
BOOM
VELCRO STRAP
How to assemble the WS-14 windscreen
Fig. 2
Frequency Response
Polar Response