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Features
• Variable stereo shotgun
microphone with shotgun and
figure-8 patterns
• Interference/pressure-gradient
transducer
• MS-stereo microphone,
switchable to XY-stereophony
• Transformerless circuitry
• Switchable low frequency roll-
off and switchable 10 dB
preattenuation
• Set with case and accessories
• Battery or phantom powering
Construction
The RSM191 consists of a capsule head con-
taining two separate transducer systems and an
amplifier section with two independent trans-
formerless microphone amplifiers.
An interference tube system with a hypercar-
dioid characteristic generates the middle sig-
nal, while a horizontal figure-8 assembly pro-
vides the side signal.
Acoustic features
The RSM 191 achieves its high directivity and
special acoustic features through a unique con-
struction. The microphone
capsule assembly is mounted
inside a housing tube that is
acoustically open but has a
high flow resistance.
This results in a high driving
force for the diaphragm, even
with a low pressure gradient
factor of the capsule. There-
fore, the microphone can sup-
press unwanted off-axis inter-
ference to a considerably high-
er degree than other micro-
phones without such an inter-
ference tube.
The middle system (M-signal) combines high
attenuation of lateral sound incidence, similar
to a hypercardioid characteris-
tic (which is about 10dB),
with the large front-to back ra-
tio of the super-cardioid char-
acteristic.
Therefore, sound from the rear
is likewise attenuated by ap-
proximately 10 dB. This design
approach makes the micro-
phone less sensitive to wind or
pop noise than other shotgun
microphones.
The side system (S-signal)
consists of two single capsules
arranged back to back, closely
behind the interference tube (M-signal) cap-
sule. Arrows engraved on the microphone hous-
ing show their orientation.
The uniform and balanced performance char-
acteristic of the microphone system is achiev-
ed without resorting to corrective resonance
effects. Therefore, the microphone maintains
he RSM 191 is a stereo microphone sys-
tem consisting of the microphone and the
MTX 191 A matrix amplifier.
It has an adjustable pick-up
angle and high directivity.
The microphone has two sep-
arate capsule systems, a hy-
percardioid element and a
figure-8, both in a short shot-
gun. Together they generate
the mid and the side signals.
The matrix amplifier controls
the width of the stereo image
by changing the gain of the
side signal relative to the
middle signal in six 3dB
steps.
The output signals of the matrix amplifier are
either mid-side (MS) or left/right (XY). The
signals are converted through transformerless
sum-and-difference circuitry.
The balanced, transformerless technology
permits the use of long cables between the
microphone, the matrix amplifier and the fol-
lowing mic input of other signal processing
equipment.
Applications
The RSM191 system is an ideal microphone
system for:
Outdoor stereophonic news coverage, even in
extremely noisy surroundings;
Stereo recordings for film and television
where the actors are recorded simultaneously
with acoustic ambiance, or an orchestra;
Stereophonic motion picture sound where the
width of the sound image must match the
camera viewing angle.