Microfoane Shotgun Neumann KMR 81i

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

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.

Recordings for broadcasting/ENG, film and video productions
Medium length shotgun spot mic in noisy surroundings
Balanced weight during handheld and boom/fishpole operation
These are just some of the most common applications. We recommend additional experimentation to gain maximum use from this microphone.

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 and also serves as soft padding of the microphone in its leather carrying case.

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, CCIR (1) 23 dB
Equivalent noise level, A-weighted (1) 12 dB-A
Signal-to-noise ratio, CCIR (1) (rel. 94 dB SPL) 71 dB
Signal-to-noise ratio, A-weighted (1) (rel. 94 dB SPL) 82 dB
Maximum SPL for THD 0.5% (2) 128 dB
Maximum SPL for THD 0.5% with preattenuation (2) 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 ± 4 V
Current consumption (P48, IEC 61938) 0.8 mA
Matching connector XLR3F
Weight 145 g
Diameter 21 mm
Length 226 mm

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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

Interactive view of diagrams (click pe poza) Interactive view of diagrams

Livrarea include:

Microphone KMR 81 i (mt)
Windscreen WS 81
Leather carrying case

Garantie: 24 luni.

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Microfoane Shotgun Neumann KMR 81i
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KMR 81 i shotgun microphone: Detail view of the microphone capsule
KMR 81 i shotgun microphone: Detail view of the switches
KMR 81 i shotgun microphones: Detail view
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