Crown Audio, Inc.
P. O. Box 1000
Elkhart, IN 46515-1000
TEL: 219-294-8000
FAX: 219-294-8FAX
www.crownaudio.com
©
2000 Crown Audio, Inc.
Specifications subject to change without prior notice.
Latest information available at www.crownaudio.com.
Crown
®
is a
registered trademark of Crown Interna-
tional, Inc.
12/00 102547-3
CM-312A
CM-312AE
CM-312AE Schematic
How to connect the CM-312AE to a wireless
transmitter
1. Solder on a connector that mates with your
transmitter. Technical Bulletin #3 (included)
shows the correct wiring for various transmit-
ters.
2. Plug in the cable. Adjust the trim pot on the
transmitter input to prevent distortion.
Architects’ and Engineers’ Specifications
The microphone shall be the Crown Model
CM-312A or equivalent. The microphone shall
be a head-worn hypercardioid type of electret-
condenser design. The microphone shall
exhibit excellent off-axis response and gain-
before-feedback. The microphone shall have
an adjustable headband, adjustable boom with
locking thumbscrew, and foam pop filter.
Model CM-312A shall include a headworn mic
and a battery belt pack. Model CM-312AE
shall be the head-worn microphone alone. In
the CM-312A, a 3-feet (0.915-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, a battery on/off switch, a
programmable mic on/off switch, and a “Mic
On” LED. In the CM-312AE, a 45-inch (1.144-
m), permanently attached, two-conductor
shielded cable can be connected to a transmit-
ter.
The CM-312A shall be powered by a 9V bat-
tery in the belt pack, or by 18 to 48V phantom
power. The CM-312AE shall be powered by
3–9V from a transmitter.
Nominal open-circuit sensitivity shall be 3.8
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 off-axis response,
over 20 dB down at the rear nulls. The Crown
models CM-312A and CM-312AE are speci-
fied.
Warranty
Crown professional microphones are guaran-
teed unconditionally against malfunction from
any cause for a period of three years from date
of original purchase. Please refer to the en-
closed full warranty statement for more detail.
Service
If the microphone does not function prop-
erly, check that it is aimed correctly and is
connected as described in this data sheet.
If the microphone is defective, return it in
the original packaging to: Crown Service
Department, Plant 2 SW, 1718 West
Mishawaka Road, Elkhart, IN 46517. For
further assistance or technical support call
800-342-6939.
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