Crown DIFFEROID CM-311A Bagaimana cara menggunakan - Halaman 4
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Fig. 5
3. Now bend the headband wire to fit your
head. Put the foam-block wire behind your
ear. Then you can bend the earpieces to fit
snugly around your ears. The back of the
headband should fit firmly against the back
of your neck.
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 pre-
vents boom bounce when you move around.
5. Be sure that the thumbscrew is still loos-
ened a little. Move the boom in or out, and
left or right, to center the mic directly in
front of your lips. The foam pop filter
should press firmly against the lips. This
is necessary because the mic cancels
sounds that are not close to it. Also, it keeps
the boom from bouncing. Tighten the
thumbscrew and you're done.
Once you've adjusted the headset, it should
remain in that position -- no further adjust-
ments are needed. You can still swing the
mic up or down, away from your lips, if you
don't want to be heard on the P.A. — or use
the mic on/off switch programmed for
"press off" operation.
After several hours of use, the foam pop
filter can become clogged with moisture,
giving a muffled sound. Periodically wash it
in mild detergent and water. The foam pop
filter is held in place by a removable ring.
Additional WS-6 pop filters can be ordered
from Crown's Parts Department.
How to insert a battery in the CM-311A
belt pack
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. To prolong
battery life, turn off the battery switch when
not in use.
If you're using phantom power, and the
battery switch is on, the battery will take
over automatically if phantom power fails.
After 85 hours of use, or if the sound is
distorted, it's time to replace the battery.
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.
* Momentary on.
* Momentary off (as supplied).
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.
How to connect the CM-311AE to a wire-
less transmitter
1. Solder on a connector that mates with
your transmitter. Technical Bulletin #3 (in-
cluded) shows the correct wiring for various
transmitters. A wireless transmitter must
have separate leads for ground, audio and
bias (3-9 volts).
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-311A 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.
The microphone shall have an adjustable
headband, adjustable boom with locking
thumbscrew, and foam pop filter.
Model CM-311A shall include a battery belt
pack. Model CM-311AE shall be the head-
worn microphone alone. In the CM-311A, a
42-inch, permanently attached, two-conduc-
tor shielded cable shall connect the micro-
phone to the belt pack. The belt pack shall
include a 3-pin pro audio (XLR type) con-
nector. In the CM-311AE, a 42-inch, perma-
nently attached, two-conductor shielded
cable can be connected to a transmitter.
Model CM-311A shall be powered by a 9V
battery in the belt pack, or by 18 to 48V
phantom power. The belt pack shall have a
battery on/off switch, a programmable mic
on/off switch, and a "Mic On" LED. Model
CM-311AE shall be powered by 3–9V DC
from a transmitter.
Nominal open-circuit sensitivity shall be 4
or 1.25 mV/Pa. Maximum SPL shall be 148
dB SPL for 3% THD. Equivalent noise shall
be 27 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 null. The Crown models CM-311A and
CM-311AE are specified.
Microphone Warranty
Crown professional microphones are guar-
anteed unconditionally against malfunction
from any cause for a period of three years
from date of original purchase. See en-
closed warranty sheet for additional infor-
mation.
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 De-
partment, Plant 2SW, 1718 West
Mishawaka Road, Elkhart, IN 46517. For
further assistance or technical support call
800-342-6939.