Neumann KMR 81 i
Neumann KMR 81 i
Neumann KMR 81 i
Neumann KMR 81 i
Neumann KMR 81 i
Neumann KMR 81 i
Neumann KMR 81 i
Neumann KMR 81 i

Neumann KMR 81 i

Color: Nickel
Price
$1,269
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Color: Nickel

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KMR 81 i

Short version of the classic shotgun mic, with switchable filter and pre-attenuation functions. Excellent off-axis (lateral and rear) attenuation. Free of coloration.

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

The advantage is that a sound source, for example an actor on stage, will not change its apparent tonal balance when moving within this area.
Applications
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 are film and video recordings, where the microphone should not appear in the picture.

The KMR 81 has been specifically designed for electronic news gathering.
Acoustic features
In principle, Neumann shotgun microphones use a combination of a pressure gradient transducer and an interference tube. If the wavelength of the frequency is longer than the tube length, the microphones work as pressure gradient 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 microphones may even overlap as, for example, during recordings on a large stage, without causing any problem.

The KMR 81 is less sensitive to wind and pop noise when compared to the KM 150 miniature microphone with a similar high directivity. The shotgun microphone features extremely low self noise, good impulse response, and high output level.
Polar patterns
The KMR 81 is a 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 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 90° for audio signals that determine the tonal balance of the program material.
Filter and attenuation
The microphone has a 10 dB attenuation switch to prevent the input of the following unit 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.
Use on location
The shotgun microphone features very high output capability and a remarkably low self-noise level.

Its low power consumption, light weight, and low sensitivity to wind and handling noise, makes it an ideal tools for news gathering on location.

Small dimensions, together with a balanced center of gravity, make handling easy without any whiplash effect.

However, when on location and during strong wind conditions, we recommend using an additional wind screen (included as standard accessory). The wind screen is made of polyurethane foam.

For mobile use a handle and an elastic suspension are available.
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

 

Technical Data

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, CCIR1)

23 dB

Equivalent noise level, A-weighted1)

12 dB-A

Signal-to-noise ratio, CCIR1) (rel. 94 dB SPL)

71 dB

Signal-to-noise ratio, A-weighted1) (rel. 94 dB SPL)

82 dB

Maximum SPL for THD 0.5%2)

128 dB

Maximum SPL for THD 0.5% with preattenuation2)

138 dB

Maximum output voltage

1.3 dBu

Supply voltage (P48, IEC 61938)

48 V ± 4 V

Current consumption (P48, IEC 61938)

0.8 mA

Matching connector

XLR3F

Weight

145 g

Diameter

21 mm

Length

213 mm

______________________________________________
1) according to IEC 60268-1; CCIR-weighting acccording to CCIR 468-3, quasi peak; A-weighting according to IEC 61672-1, RMS
2) measured as equivalent el. input signal

 

Accessories

Adapter Cable AC 22
Adapter Cable AC 25
Adapter Cable AC 27
Auditorium Hanger MNV 21 mt
Auditorium Hanger MNV 87 (mt)
Battery Supply BS 48 i
Battery Supply BS 48 i-2
Boom Attachment M 212 c
Elastic Suspension EA 2124 A mt
Floor Stand MF 5
Microphone Cable IC 3 mt
Power Supply N 248
Stand M 210/1
Stand M 214/1
Stand M 252
Stand Extension STV 4/20/40/60
Stand Mount SG 21 bk
Table Stand MF 2
Table Stand MF 3
Table Stand MF 4
Vertical Bar MZEF 8060/8120
Windscreen WKE 81 Set
Windscreen WS 81

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