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Neumann U 47 fet
Photo: Neumann, from its spec sheet (Recording Hacks copy), p. 1.

Neumann

Neumann U 47 fet

Large-diaphragm FET condenser, cardioid, with pad and low cut; made 1972 to 1986 (the 1983 manual) and again as the 2014 Collectors Edition

Type
Condenser
Pattern
Cardioid
Sensitivity
−41.9 dBV/Pa computed
Self-noise
18 dB(A)
Max SPL
137 dB SPL
Impedance
150 Ω
Rated range
40 – 16k Hz

Frequency response

Angle
Distance

Frequency response: from the spec sheet (Recording Hacks copy), p. 4. Graph without a title; the polar beside it is "measured in free-field conditions (IEC 60268-4)".

Independent measurement: also drawn, from the Multi-Angle, Multi-Distance Microphone Impulse Response Dataset (Juan Carlos Franco Hernández, Bogdan Bacila, Tim Brookes, Enzo De Sena, University of Surrey) (CC BY 4.0): one unit, measured at 1.25 m and set to 0 dB at 1 kHz, from 136 Hz up. Not the manufacturer's curve.

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

Polar pattern

Polar pattern: from the spec sheet (Recording Hacks copy), p. 4. Polar plot without a title, "measured in free-field conditions (IEC 60268-4)". 125 Hz to 1 kHz on the left half, 2 to 16 kHz on the right; 0° at the top, rings every 5 dB labelled 0 to 20, centre -25 dB.

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All specs

From the spec sheet (Recording Hacks copy)
Capsulepressure-gradient transducer, large diaphragmp. 4
Sensitivity−41.9 dBV/Pa (8 mV/Pa), 1 kHz into 1 kohm. Not stated by the manufacturer: Printed as 8 mV/Pa; converted with 20·log10(mV/1000).
Self-noise18 dB(A), IEC 60268-1; A-weighted per IEC 61672-1, RMS
Self-noise (CCIR 468)25 dB, CCIR 468-3, quasi peak
Max SPL137 dB SPL, 0.5% THD; also 147 dB SPL, with pre-attenuation. Measured as an equivalent electrical input signal.
Signal-to-noise ratio76 dB, A-weighted, re 94 dB SPL; also 69 dB, CCIR
Output impedance150 ohm
Rated load impedance1000 ohm. The 1983 manual (p. 8) gives 750 ohm.
Rated frequency range40 Hz to 16 kHz
Poweringphantom P48, 48 V ± 4 V (IEC 61938)
Current draw0.5 mA
Low cutoff, on. The frequency and slope are not stated; the curve is on p. 4.p. 3
Pad−10 dB; also −6 dB. "a –6/–10 dB PAD".
Weight710 gp. 4
Dimensions63 × 160 mm. Diameter × length.
Finishnickel. Order number "ni" (nickel).
Supplied accessorieswooden case; certificate. Equipment supplied. Optional: N 248 power supply, PS 15 and PS 20 a pop screens, WS 47 foam windscreen.
Max. output voltage-3.3 dBu (0.5% THD)
From the manual (Recording Hacks copy)
Original version (1983 manual)super-cardioid; 40 Hz to 16 kHz; 8 mV/Pa; 750 ohm load; 137 dB SPL (147 dB with pre-attenuation); 15 hours on a battery supplyp. 8

Documents

Copies kept by Mic Archive, because manufacturers move and drop their documents. Each is © Neumann, unchanged, with its original address.

Recording Hacks

Recommended for

Instruments whose sources name this mic, or an earlier version or variant of it.

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