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Neumann KMR 81 i
Photo: Neumann, from its catalog, p. 52.

Neumann

Neumann KMR 81 i

Short shotgun condenser: a pressure-gradient capsule in an interference tube, supercardioid/lobe pattern; for film dialogue and ENG

Type
Condenser
Pattern
Supercardioid / lobar
Sensitivity
−34.9 dBV/Pa
Self-noise
12 dB(A)
Max SPL
128 dB SPL
Impedance
150 Ω
Rated range
20 – 20k Hz

Frequency response

Angle
Distance

Frequency response: from the manual, p. 5. Free field, IEC 60268-4, tolerance ± 2 dB ("measured in free-field conditions (IEC 60268-4), tolerance ±2 dB", printed under the graph). Distance not stated.

Dashed: outside the rated range, or simulated (other angles and distances). Hover or tap the graphs for values.

Polar pattern

Polar pattern: from the manual, p. 5. Free field (as the response). Each curve is drawn on one side only (125 Hz to 1 kHz left, 2 to 16 kHz right); the pattern is taken as symmetric. Switch settings not stated.

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All specs

From the manual
Capsulepressure-gradient capsule inside an acoustically open interference tube of high acoustic impedance, elastically suspended. "the microphone capsule is located inside an interference tube which is acoustically open but has a high acoustic impedance"; "Finger noises are suppressed by the internal elastic suspension of the microphone capsule."p. 2
Sensitivity−34.9 dBV/Pa (18 mV/Pa), 1 kHz into 1 kohm rated load; ± 1 dB. Stated as 18 mV/Pa ± 1 dB; converted: 20·log10(0.018) = -34.9.p. 4
Self-noise12 dB(A), IEC 60268-1, A-weighting IEC 61672-1, RMS. "12 dB-A".
Self-noise (CCIR 468)23 dB, CCIR 468-3, quasi peak
Max SPL128 dB SPL, 0.5% THD; also 138 dB SPL, with preattenuation. "THD of microphone amplifier at an input voltage equivalent to the capsule output at the specified SPL." The catalogue (p. 53) headlines "Max SPL 138 dB", the figure with the pad.
Signal-to-noise ratio82 dB, re 94 dB SPL, A-weighted; also 71 dB, re 94 dB SPL, CCIR 468-3
Dynamic range116 dB. "corresponding to a 116 dB dynamic range" (12 dB-A to 128 dB).p. 2
Output impedance150 ohm, rated impedancep. 4
Rated load impedance1000 ohm, rated load impedance
Rated frequency range20 Hz to 20 kHz
Poweringphantom P48, 48 V ± 4 V (IEC 61938)
Current draw0.8 mA
Low cutoff, on; 200 Hz. Slide switch: "approx. –15 dB at 50 Hz ... leaving the response above 200 Hz unchanged". The catalogue (p. 53): "A second switch activates a 200 Hz low cut to compensate for the proximity effect".p. 2
Pad−10 dB. "The high sensitivity (approx. 18 mV/Pa) may be attenuated by 10 dB by means of a built-in slide switch".
ConnectorXLR-3 male. Matching connector "XLR 3 F"; pin 2 +phase, pin 3 -phase, pin 1 ground (p. 3).p. 4
Weight145 g
Dimensions21 × 226 mm. Diameter 21 mm × length 226 mm.
Finishmatt nickel (KMR 81 i) or matt black (KMR 81 i mt)p. 2
Supplied accessoriesWS 81 foam windscreen; leather carrying bag. "The microphone comes in a leather carring bag, including windshield WS 81."
Max. output voltage1.3 dBup. 4
Acoustic principlePressure gradient interference transducer
Cat. No.KMR 81 i (nickel) 006961; KMR 81 i mt (black) 006962p. 2
WS 81 windscreenSupplied foam windscreen: 15 dB wind noise attenuation, 2 dB at 15 kHz; 50 mm diameter, 195 mm long (Cat. No. 007268)p. 7
Use (Neumann)Film dialogue and ENG at medium distance; stage pick-up; isolating instruments in orchestras and bands; outdoor reporting; conference podiump. 2

Documents

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