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Crown International, Inc.
1718 W. Mishawka Rd.
Elkhart, IN 46517-9439
TEL: 574-294-8000
FAX: 574-294-8FAX
www.crownaudio.com
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 datasheet.
If you determine that the microphone product is defec-
tive, return the complete product in its original pack-
aging to Crown Factory Service, 1718 W. Mishawaka
Road, Elkhart, IN 46517-9439. A Service Return
Authorization (SRA) is required for product being
returned for service. An SRA can be completed on
line at:
www.crownaudio.com/support/factserv.htm.
For further assistance or technical support call 800-
342-6939.
4/08 102547-7A
CM-312AE
The closer the mic is to your mouth, the bassier is the
tone. Adjust the position for the sound you prefer. If
you hear breath pops, move the mic farther to the side
of your mouth (Fig. 4). Tighten the thumbscrew.
Once you’ve adjusted the headset, it should remain in
that position – no further adjustments are needed.
When using the mic for aerobics, you’ll need to keep
the cable in place. To do this, attach the cable to the
clothes clip (included), and clip it to the back of your
shirt. As shown in Fig. 5, be sure that the cable droops
BELOW the clip. That way, sweat drips off the cable
instead of into your transmitter.
Additional clothing clips can be ordered from Crown’s
Parts Department.
How to connect the CM-312AE to a wireless trans-
mitter
1. Solder on a connector that mates with your trans-
mitter. Technical Bulletin #3 (included) shows the
correct wiring for various transmitters.
2. Plug in the cable. Adjust the trim pot on the trans-
mitter input to prevent distortion.
Architects’ and Engineers’ Specifi cations
The microphone shall be the Crown Model CM-312AE
or equivalent. 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 headband, adjustable boom with locking
thumbscrew, and foam pop fi lter.
The microphone shall have a 45-inch (1.14-m),
permanently attached, two-conductor shielded unter-
minated cable that can be connected to a transmitter.
Powering shall be 3–9V from the transmitter.
Nominal open-circuit sensitivity shall be 2.9 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 model CM-312AE is specifi ed.
Fig. 6
Dimensions
Fig. 5 Let the cable droop below the clip to
shed moisture.
Adjust mic position to prevent breath pops.
Fig. 4
© 2008 Crown Audio
®
, Inc. Specifi cations subject
to change without prior notice. Latest information
available at www.crownaudio.com. Crown and
Crown Audio are registered trademarks of Crown
International.