Neumann KMR 81i Shotgun Microphone


The Neumann KMR 81i is a shotgun microphone with a high directivity that remains within the acceptance angle independent of the frequency.

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Neumann KMR 81i

The Neumann KMR 81i is a shotgun microphone with a high directivity that remains within the acceptance angle independent of the frequency.

Shotgun microphones are particularly 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 for the KMR 81 are film and video recordings, where the microphone should not appear in the picture. The KMR 81 also has been specifically designed for electronic news gathering where rejection of ambient noise may be desired as well as low sensitivity to wind.

The KMR 81 shotgun microphone features extremely low self noise and high output level. The microphone capsule is positioned inside a housing tube that is acoustically open but has a high flow resistance. The directional pattern of the microphone is lobe shaped. The attenuation of lateral sound is practically independent of the frequency. The KMR 81 has a frequency independent directivity within a pickup angle of 90ᄚ for audio signals that determine the tonal balance of the program material.

The microphone has a 10 dB attenuation switch to prevent the input from overloading. A second switch activates a 200 Hz high-pass filter. Toward the lower frequencies the sensitivity of the microphone is attenuated by approximately 15 dB at 50 Hz. The frequency range above 200 Hz is unaffected.

The shotgun microphone features very high output capability and a remarkably low self-noise level.

Neumann KMR 81i Features:

  • Interference tube microphone with shotgun directional characteristic
  • Interference/pressure-gradient transducer
  • High lateral and back attenuation
  • 90°-recording angle
  • Switchable filter or preattenuation features
  • Extensive accessories for outdoor use
  • Light weight: 145 g


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Acoustical operating principle:Interference transducer
Directional pattern:Supercardioid/lobe
Frequency range:20 Hz - 20 kHz
Sensitivity at 1 kHz into 1 kohm:18 mV/Pa
Rated impedance:150 ohms
Rated load impedance:1 kohms
Equivalent noise level, CCIR:23 dB
Equivalent noise level, A-weighted:12 dB-A
Signal-to-noise ratio, CCIR (rel. 94 dB SPL):71 dB
Signal-to-noise ratio, A-weighted (rel. 94 dB SPL):82 dB
Maximum SPL for THD 0.5%:128 dB
Maximum SPL for THD 0.5% with preattenuation:138 dB
Maximum output voltage:1.3 dBu
Dynamic range of the microphone amplifier (A-weighted):116 dB
Supply voltage (P48, IEC 61938):48 V ᄆ 4 V
Current consumption (P48, IEC 61938):0.8 mA
Matching connector:XLR3F
Weight:145 g/5.1 oz
Diameter:21 mm/.83"
Length:226 mm/8.9"