Large Diaphragm Condenser Broadcast Microphone
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The BCM-104 Large Diaphragm Condenser
Broadcast Microphone from Neumann features a large-diaphragm, cardioid
condenser capsule. It has a frequency response that is flat up to 3 kHz
and then gradually boosted in the higher frequencies. If required,
internal switches can be used to compensate for the proximity effect and
to reduce the sensitivity by 14 dB.
The microphone headgrille
twists off for quick cleaning. In front of the capsule, mounted on a
frame holder, a fine gauze serves as a built-in popscreen. The
microphone has an elastic mount against structure-borne noise, that is
compatible with standard broadcast-segment microphone arms.
The
microphone headgrille houses the K 04 large-diaphragm capsule, which has
a flat frequency response up to 3 kHz. Higher frequencies have an
increased presence up to 2 dB. Since the above-mentioned microphone
characteristics are obtained without the use of resonance effects, the
microphone features excellent transient response and transmits all
transient phenomena of music and speech without any coloration.
A
pop screen not only prevents the occurrence of plosive pop noises in
vocal recordings, but also efficiently prevents unwanted particles, from
respiratory moisture, nicotine, to food remnants, from settling on the
diaphragm. The pop screen can be removed for cleaning without the use of
tools.
Instead of a transformer to couple the microphone output
to the supply voltage, the BCM-104 has an electronic circuit which, like
a transformer, provides for good common mode rejection. Interference
induced in the balanced modulation line is thus suppressed effectively.
With a very low self-noise of 7 dB(A), and an overload capability
extending to 138 dB SPL, the BCM-104 has a dynamic range of 131 dB
(A-weighted).
The BCM-104 amplifier has a linear operation down
to 20 Hz. An active filter efficiently suppresses signals below this
frequency. In order to compensate for the proximity effect, an
electronic high-pass filter, activated by a switch, is built into the
microphone. This filter reduces frequencies below 100 Hz by 12
dB/octave. A 14 dB pre-attenuation switch is provided in order to adjust
the sensitivity, if necessary, to circuits designed for dynamic
microphones. But this will increase the self-noise accordingly. Both
switches are located inside the microphone housing, since they will
normally be operated only once, when the broadcasting facility is set
up.
The preferred mode of operation is to suspend the BCM-104
from a standard studio boom arm. A thread adapter to fit different
connector threads is included. In order to provide protection from
structure-borne noise, both the capsule and the microphone in its mount
are elastically suspended.
Features:
-Operating Principle Pressure Gradient
-Transducer Condenser
-Polar Pattern Cardioid
-Frequency Range 20 Hz to 20 kHz
-Signal to Noise Ratio 76 dB CCIR
-87 dB A-Weighted
-Maximum SPL 138 dB SPL
-152 dB SPL
-Pad 14 dB
-Impedance 50 ohms
-Load Impedance 1 kOhms
-Sensitivity 22 mV/Pa at 1 kHz into 1 kOhms