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Neumann BCM 104 mikrofon


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Opis proizvoda

With its large-diaphragm condenser capsule and cardioid directional characteristic, the BCM 104 is ideal for the faithful reproduction of speech and music. This is due, for instance, to the frequency response that is flat up to 3 kHz and then gradually boosted in the higher frequencies. If required, internal switches c

Mechanical Features

The microphone headgrille twists off easily for quick cleaning.
Neumann offers optional color-coded headgrilles so that, for reasons of
hygiene, each announcer can use his or her individual headgrille. In
front of the capsule, mounted on a frame holder, a fine gauze serves as a
built-in popscreen.

The microphones of the Broadcast Line
have an elastic mount against structure-borne noise, that is compatible
with standard broadcast-segment microphone arms.

Acoustic features

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.

The integrated Pop Screen

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.

Electrical features

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.

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).

Filter and Preattenuation

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.

14-dB preattenuation 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 or BCM 705 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.

The optional SG 5 swivel mount allows additional angling of the microphone by +/-90 degrees.

* The design of the microphone is a registered design of the Georg Neumann GmbH in certain countries

Tehničke specifikacije proizvoda

  • Acoustical operating principle Pressure gradient transducer
  • Directional pattern Cardioid
  • Frequency range 20 Hz ... 20 kHz
  • Sensitivity at 1 kHz into 1 kohm 22 mV/Pa
  • Sensitivity at –14 dB attenuation 4.4 mV/Pa
  • Rated impedance 50 ohms
  • Rated load impedance 1 kohms
  • Equivalent noise level, CCIR1) 18 dB
  • Equivalent noise level, A-weighted1) 7 dB-A
  • Maximum SPL for THD 0.5%2) 138 dB
  • Maximum SPL for THD 0.5% with preattenuation2) 152 dB
  • Signal-to-noise ratio, CCIR1) (rel. 94 dB SPL) 76 dB
  • Signal-to-noise ratio, A-weighted1) (rel. 94 dB SPL) 87 dB
  • Maximum output voltage 10 dBu
  • Dynamic range of the microphone amplifier (A-weighted) 131 dB
  • Supply voltage (P48, IEC 61938) 48 V ± 4 V
  • Current consumption (P48, IEC 61938) 3.2 mA
  • Matching connector XLR3F
  • Weight 500 g
  • Diameter 64 mm
  • Length 85 mm
  • Height (without suspension) 110 mm