Product Information
RSM 191
Stereo Shotgun
Microphone
www.neumann.com
Georg Neumann GmbH, Berlin • Ollenhauerstr. 98 • 13403 Berlin • Germany • Tel.: +49 (30) 417724-0 • Fax: +49 (30) 417724-50
E-Mail: headoffice@neumann.com, engineering@neumann.com, catalog-info@neumann.com • Web: www.neumann.com
he RSM 191 is a stereo microphone system 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 separate capsule systems, a hypercardioid element and a
figure-8, both in a short shotgun. Together they generate
the mid and the side signals.
Construction
The RSM 191 consists of a capsule head containing two separate transducer systems and an
amplifier section with two independent transformerless microphone amplifiers.
An interference tube system with a hypercardioid characteristic generates the middle signal, while a horizontal figure-8 assembly provides the side signal.
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 3 dB
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 following mic input of other signal processing
equipment.
Applications
The RSM 191 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.
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 rolloff and switchable 10 dB
preattenuation
• Set with case and accessories
• Battery or phantom powering
Acoustic features
The RSM 191 achieves its high directivity and
special acoustic features through a unique construction. 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. Therefore, the microphone can suppress unwanted off-axis interference to a considerably higher degree than other microphones without such an interference tube.
The middle system (M-signal) combines high
attenuation of lateral sound incidence, similar
to a hypercardioid characteristic (which is about 10 dB),
with the large front-to back ratio of the super-cardioid characteristic.
Therefore, sound from the rear
is likewise attenuated by approximately 10 dB. This design
approach makes the microphone 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) capsule. Arrows engraved on the microphone housing show their orientation.
The uniform and balanced performance characteristic of the microphone system is achieved without resorting to corrective resonance
effects. Therefore, the microphone maintains
an excellent impulse response, reproducing all
transient phenomena in music and speech
without coloration. The entire internal construction is decoupled from the housing to
avoid structure borne and handling noise.
Electrical features
The output signals of the included matrix amplifier are in either MS or XY format. The small
capsules are mounted in close proximity to ensure transparent and coloration-free stereo
sound with excellent mono-compatibility. The
stereo acceptance angle is variable and controlled remotely.
Filter and attenuation
RSM 191
For the handling of very high
sound pressure levels, a 10 dB
attenuation can be switched
ON to avoid overloading of the
following equipment.
To suppress structure borne
noise, a high-pass filter in the
matrix box provides cutoff frequencies of 40 Hz, 80 Hz, and
200 Hz.
Battery supply
The RSM 191 system is fed
from either 2 x P48 phantom
power or from a 9 V battery inside the matrix box.
One alkaline battery provides
8 hours of operation.
Technical Data
Acoustical operating principle ............ M: Pressure gradient/interference
Directional pattern ............................................................................. M: Lobe-shaped
Frequency range .................................................................................. 20 Hz...20 kHz
Sensitivity at 1 kHz into 1 kohm ........................................................... 23 mV/Pa
Rated impedance ................................................................................................ 50 ohms
Rated load impedance .............................................................................. 1000 ohms
Signal-to-noise ratio, CCIR1) (rel. 94 dB SPL) .............................. 69/63 dB
Signal-to-noise ratio, A-weighted1) (rel. 94 dB SPL) ............... 78/72 dB
1)
according to IEC 60268-1; CCIR-weighting acccording to CCIR 468-3, quasi peak; A-weighting according to IEC 61672-1, RMS 2) M/S 3) measured as equivalent el. input signal
S: Pressure gradient transducer
transducer
S: Figure-8
Equivalent noise level, CCIR1)................................................................ 25/31 dB
Equivalent noise level, A-weighted1)............................................ 16/22 dB-A
Maximum SPL for THD 0.5%3).................................................................. 134 dB
Maximum SPL for THD 0.5% with preattenuation3)................... 144 dB
Maximum output voltage ........................................................................... 2540 mV
Supply voltage (P48, IEC 61938) .......................................... 2 x 48 V ± 4 V
Current consumption (P48, IEC 61938) ..................................... 2 x 1.9 mA
Matching connector ..................................................................................... 2 x XLR3F
Weight .............................................................................................................................170 g
2)
Diameter ...................................................................................................................... 30 mm
2)
Length........................................................................................................................ 212 mm
2)
2)
Delivery range
The complete miocrophone
system comes in a robust aluminum carrying case.
Along with the microphone
and the matrix amplifier the
case contains a windscreen, the
special interconnecting cable
and an adapter cable that splits
the 5-pin XLR output of the
matrix amplifier into two 3-pin
XLR connectors for channels I
and II to connect with the following equipment.
Application Hints
• Stereo recordings for
- broadcasting/ENG,
- film productions
- video productions
• Recordings with variable stereo width
• Handheld and boom/fishpole operation
• As variable stereo overhead system for drums (percussion)
These are just some of the most common applications. We
recommend additional experimentation to gain maximum use
from this microphone.
Delivery Range
Microphone RSM 191
Matrix amplifier MTX 191 A
Microphone cable KT 5
Adapter cable AC 20
Windscreen WS 191
Aluminium case
Catalog No.
RSM 191 A Set .......................................... blk ...... 007087
Selection of Accessories
Power supply, N 248 EU ................... blk ......008537
Power supply, N 248 US .................... blk ......008538
Power supply, N 248 UK ................... blk ......008539
Auditorium hanger, MNV 87 mt .... blk ......006806
Elastic suspension, EA 30 B mt ..... blk ...... 006349
Microphone cable, KT 6
(with stand mount swivel) ................... blk ......006725
Microphone cable, IC 7 ......................... blk ...... 006740
A complete survey and detailed descriptions
of all accessories are contained in the
accessories catalog.
Meaning of color codes:
blk = black
ni = nickel
M-SystemS-System
measured in free-field conditions (IEC 60268-4), tolerance ±2 dB
Errors excepted, subject to changes • Printed in Germany • Publ. 01/08 058163/A04
Neumann is a registered trademark of the Georg Neumann GmbH in certain countries.
®
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