Emotion conveyed with technical perfection. This is the ideal which
the Neumann microphones in the Broadcast Line have been designed to fulfill.
The fine-tuning to the requirements of professional broadcast studios
and the individual, functionally optimized design* ensure that these are
microphones of character.
With its large-diaphragm condenser capsule and cardioid directional characteristic,
the Neumann 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 can be used to compensate for the proximity effect and
to reduce the sensitivity by 14 dB. The versatility of the Neumann BCM
104 can be seen in its wide range of applications, from news, to round-table
discussions, to radio plays, to musical recordings.
Interactive Frequency Response - LINK )
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
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
The Neumann 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 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 Neumann BCM 104 or
Neumann 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 Neumann SG 5 swivel mount
allows additional angling of the microphone by +/-90 degrees.
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
Instead of a transformer to couple the microphone output to the supply
voltage, the Neumann 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 Neumann
BCM 104 has a dynamic range of 131 dB (A-weighted).