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Neumann KMR81I

Short shotgun (9 in) with twist pack case and WS 81

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The KMR 81 i Shotgun Microphone from Neumann uses a combination of a pressure gradient transducer and an interference tube. If the wavelength of the frequency is longer than the tube length, the microphone works as a pressure gradient transducer. At higher frequencies, it operates as an interference transducer for lateral sound. Off axis sound sources are picked up with reduced level, but without coloration. Therefore, the microphone is well suited to record individual instruments of an orchestra. The pickup areas of several shotgun microphones may even overlap as, for example, during recordings on a large stage, without causing any problem.

  • Interference tube microphones with shotgun directional characteristic
  • Interference/pressure gradient transducer
  • High lateral and back attenuation
  • 90°/45°-recording angle
  • Switchable filter or preattenuation features
  • Extensive accessories for outdoor use


Operating PrinciplePressure Gradient
Polar PatternSupercardioid
Frequency Range20 Hz to 20 kHz
Signal to Noise Ratio71 dB CCIR82 dB A-Weighted
Equivalent Noise Level23 dB CCIR12 dB A-Weighted
Maximum SPL128 dB SPL 0.5%138 dB SPL 0.5%  dB Pad Engaged
Impedance150 ohms
Load Impedance1 kOhms
Sensitivity18 mV/PA @ 1 kHz into 1 kOhms, re: 1 V/Pa
Power Requirements48 V+/- 4 V
Output Connectors3-pin XLR
Operating Current Consumption0.8 mA
Length9.09" (231 mm)
Diameter0.83" (21 mm)
Weight5.11 oz (145 g)
Package Weight1.06 lb
Box Dimensions (LxWxH)11.75 x 3.7 x 3.0"