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Condenser Cardioid
Hanging Microphones
• Available in black or white
• Braided cable shield maintains
horizontal aiming, even when
temperature and humidity vary
• Preamp mounts in standard
electrical boxes
• Steel preamp shield gives high
resistance to electrical noise and
rf interference
• Hum-bucking output transformer
cuts hum by more than 20 dB
• Screw-type output terminals are
reliable over the long term
CH230/
CH230W
Description and Application
The CH230 and CH230W hanging micro-
phones, utilize back-electret condenser tech-
nology to provide an extended, flat frequency
response with a controlled cardioid polar pat-
tern for high-quality sound reinforcement.
The CH230 and CH230W were specifically
designed to mic choirs, instrumental and
vocal groups, and live theater. The size and
color (black/white) of the transducer and
cable allow the microphone to blend in with
the surroundings.
The CH230’s low self noise and high output
signal level combine to produce an excel-
lent signal-to-noise ratio. Exceptionally
high sensitivity, a uniform cardioid polar
response, and smooth frequency response
make the CH230 ideally suited for distant
sound pick-up. The cardioid polar response
is precisely controlled and is highly effec-
tive in suppressing feedback without colora-
tion of sound. Additionally, unwanted low-
frequency noise such as the rumble from air-
moving equipment can be reduced with the
use of a switchable high-pass filter. The
filter’s corner frequency (75 Hz) is low
enough to have essentially no effect on voice
quality.
The CH230 and CH230W are easily aimed
at the performance with the supplied steel
wire hanger and holding nut. The wire hanger
attached to the microphone element and
cable can be bent to aim the microphone in
the vertical plane. The horizontal position-
ing of the microphone is accomplished by
rotating the element and locking the posi-
tion with the nut (detailed description later).
This allows the microphone to be accurately
positioned over a choir, stage or orchestra.
The CH230 and CH230W are furnished with
30 feet of black (CH230) or white
(CH230W) miniature braided shielded cable.
The design of the cable ensures the
microphone’s horizontal position will be held
stable without the need of fish-line tether-
ing.
The CH230’s electronics module and mount-
ing hardware allow quick assembly and
mounting to a standard electrical switch box
or four-inch electrical box. Figure 3 illus-
trates the assembly for either box style. Con-
necting a mixer to the electronics module is
through the output terminal block. Power is
obtained from any phantom source supply-
ing 12 to 52 volts.
Assembly
Parts List:
1 microphone with hanger and 30 ft of cable
1 round plaster ring
1 rectangular switch cover
1 printed circuit board
1 shield box
1 strain relief
2 1
1
/
4
-in. #4-40 Phillips-head screws
4
3
/
16
-in. #4-40 Phillips-head screws
2
1
/
2
-in. #8-32 Phillips-head screws
2 #4 split-ring washers
2 #4-40 hex-head nuts
4 threaded spacers
6 #4 fiber washers
Tools Required:
Medium-head (#2) Phillips screwdriver
Small-blade screwdriver
1
/
4
-in. open-end wrench
Assembly Instructions (see Figure 3):
1. Identify the type of electrical box,
switch or octagon, and select the proper
cover plate to start the assembly.
2. Position the plate with the printed side