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he KMR81 and KMR 82 are shotgun
microphones with a high directivity that re-
mains within the acceptance angle indepen-
dent of the frequency.
The advantage is that a sound source, for ex-
ample an actor on stage, will not change its
apparent tonal balance when moving within
this area.
Applications
Shotgun microphones are par-
ticularly useful in recording
situations where a microphone
cannot be positioned within
the desired distance of the
sound source to produce a
sufficiently loud signal level.
Typical applications are film
and video recordings, where
the microphone should not
appear in the picture.
The KMR82 is very often
used on stage. The KMR81
has been specifically designed for electronic
news gathering.
Acoustic features
In principle, Neumann shotgun microphones
use a combination of a pressure gradient trans-
ducer and an interference tube. If the wave-
length of the frequency is longer than the tube
length, the microphones work as pressure gra-
dient transducers. At higher frequencies they
operate as interference transducers for lateral
sound. Off-axis sound sources are picked up
with reduced level, but without coloration.
Therefore, the microphones are well suited to
record individual instruments of an orchestra.
The pickup areas of several shotgun micro-
phones may even overlap as, for example, dur-
ing recordings on a large stage, without causing
any problem.
The KMR81 and KMR 82 are less sensitive
to wind and pop noise when compared to the
KM150 miniature microphone with a similar
high directivity. Both shotgun microphones fea-
ture extremely low self noise, good impulse re-
sponse, and high output level.
Polar pattern
KMR 81 and KMR 82 are shotgun microphones
with a very directional characteristic.
The microphone capsule is
positioned inside a housing
tube that is acoustically open
but has a high flow resistance.
The directional patterns of the
microphones are lobe shaped.
The attenuation of lateral
sound is practically indepen-
dent of the frequency.
The KMR82 has a frequency
independent directivity within
a pickup angle of 45° for audio
signals that determine the ton-
al balance of the program ma-
terial. For the KMR81, this
angle is 90°.
Features
• Interference tube microphones
with shotgun directional
characteristic
• Interference/pressure-gradient
transducer
• High lateral and back
attenuation
• 90°/45°-recording angle
• Switchable filter or preattenu-
ation features
• Extensive accessories for
outdoor use
• Light weight: 145 g/250 g