Neumann.Berlin KMR 81 i User Manual

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Product Information
KMR 81/82 i
Shotgun Microphones
www.neumann.com
Georg Neumann GmbH, Berlin • Ollenhauerstr. 98 • 13403 Berlin • Germany • Tel.: +49 (30) 417724-0 • Fax: +49 (30) 417724-50 E-Mail: headoffice@neumann.com, engineering@neumann.com, catalog-info@neumann.com • Web: www.neumann.com
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he KMR 81 and KMR 82 are shotgun microphones 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 82 is very often used on stage. 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
Features
• 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
• Light weight: 145 g/250 g
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 and KMR 82 are less sensitive to wind and pop noise when compared to the KM 150 miniature microphone with a similar high directivity. Both shotgun microphones fea­ture extremely low self noise, good impulse re­sponse, 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 indepen­dent of the frequency.
The KMR 82 has a frequency independent directivity within a pickup angle of 45° for audio signals that determine the ton­al balance of the program ma­terial. For the KMR 81, this angle is 90°.
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KMR 81/82 i
Filter and attenuation KMR 81 i
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.
Filter KMR 82 i
Between 2 kHz and 15 kHz the KMR 82 has a boost to compensate for HF transmission loss­es in air when recording distant sound sources.
This may overemphasize any sibilance if the microphone is used close-up.
Use on location
The shotgun microphones feature very high output capability and a remarkably low self­noise level.
Their low power consumption, light weight, and low sensitivity to wind and handling noise, make them 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.
Therefore, a two-position slide switch allows to select the setting that is best for balanced upper frequencies.
The KMR 82 has a high-pass filter to suppress subsonic in­terference. The cutoff frequency may be raised to 120 Hz (–3 dB) with a built-in two-position slide switch.
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KMR 81 i KMR 82 i
KMR 81 i
measured in free-field conditions (IEC 60268-4), tolerance ±2 dB
Application Hints
• 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.
Delivery Range KMR 81 i
Microphone KMR 81 i (mt), Windscreen WS 81, Leather carrying case
Delivery Range KMR 82 i
Microphone KMR 82 i (mt), Windscreen WS 82, Leather carrying case
Catalog No.
KM R 8 1 i ...................................................... ni .......... 006961
KMR 81 i mt ...............................................blk ....... 006962
KM R 8 2 i ...................................................... ni .......... 006878
KMR 82 i mt ...............................................blk ....... 006879
KMR 82 i
Technical Data KMR 81 i KMR 82 i
Acoustical operating principle ................................. Interference transd. ..... Interference transd.
Directional pattern .................................................................. Supercard./lobe ............. Supercard./lobe
Frequency range .................................................................... 20 Hz...20 kHz........... 20 Hz...20 kHz
Sensitivity at 1 kHz into 1 kohm .............................................. 18 mV/Pa ......................... 21 mV/Pa
Rated impedance .............................................................................. 150 ohms ........................ 150 ohms
Rated load impedance ................................................................ 1000 ohms.....................1000 ohms
Signal-to-noise ratio, CCIR1) (rel. 94 dB SPL) ............................... 71 dB .................................7 1 dB
Signal-to-noise ratio, A-weighted1) (rel. 94 dB SPL) ................. 8 2 dB ................................. 82 dB
Equivalent noise level, CCIR1)............................................................... 23 dB ................................. 23 dB
Equivalent noise level, A-weighted1).............................................. 12 dB-A ............................ 12 dB-A
Maximum SPL for THD 0.5%2)...................................................... 128 dB .............................. 128 dB
Maximum SPL for THD 0.5% with preattenuation2)......... 138 dB ................................... -
Maximum output voltage ................................................................. 900 mV ..........................1050 mV
Dyn. range of the mic. amplifier (A-weighted) ........................ 116 dB .............................. 116 dB
Supply voltage (P48, IEC 61938) ......................................... 48 V ± 4 V ....................... 48 V ± 4 V
Current consumption (P48, IEC 61938) .................................... 0.8 mA ...............................0.7 mA
Matching connector ................................................................................ XLR3F ............................... XLR3F
Weight .............................................................................................................. 14 5 g ................................. 250 g
Diameter ...................................................................................................... 21 mm .............................. 2 1 mm
Length .......................................................................................................... 226 mm ........................... 395 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
Selection of Accessories
Battery supply, BS 48 i ........................ blk ....... 006494
Power supply, N 248 EU .................. blk ....... 008537
Power supply, N 248 US ................... blk ....... 008538
Power supply, N 248 UK .................. blk ....... 008539
Stand mount swivel, SG 82 .............. blk ....... 006616
Handle, HG 82 ......................................... blk ....... 006856
Auditorium hanger, MNV 21 mt ... blk ....... 006802
Elastic suspension, EA 82 ................. ni .......... 006846
Elastic suspension, EA 82 mt ......... blk ....... 006848
Microphone cable, IC 3 mt ................ blk ....... 006547
for KMR 81 i only:
Windscreen, WK 81 .............................. g r .......... 007275
Elastic suspension,
EA 2124 A mt ........................................... blk ....... 008433
for KMR 82 i only:
Windscreen, WK 82 .............................. gr .......... 006855
A complete survey and detailed descriptions of all accessories are contained in the accessories catalog.
Meaning of color codes: blk= black; ni = nickel; gr = grey
Errors excepted, subject to changes • Printed in Germany • Publ. 01/08 058162/A05
Neumann is a registered trademark of the Georg Neumann GmbH in certain countries.
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