Tube microphone M 147 Tube: Detail view of the head grille

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Neumann tube sound with a cardioid directional characteristic and a classic design. The double diaphragm capsule is derived from that of its legendary predecessors, the U 47 and M 49.
Zoom: Tube microphone M 147 Tube
Acoustical operating principle Pressure gradient transducer
Directional pattern Cardioid
Frequency range 20 Hz ... 20 kHz
Sensitivity at 1 kHz into 1 kohm 20 mV/Pa
Rated impedance 50 ohms
Rated load impedance 1 kohms
Equivalent noise level, CCIR1) 24 dB
Equivalent noise level, A-weighted1) 12 dB-A
Signal-to-noise ratio, CCIR1) (rel. 94 dB SPL) 70 dB
Signal-to-noise ratio, A-weighted1) (rel. 94 dB SPL) 82 dB
Typical SPL (tube characteristic)2) 114 dB for THD < 0.5 %, 134 dB for THD < 5 %
Maximum output voltage 8 dBu
Powering Power supply N 149 A
Matching connector Microphone: DIN 8F, Power Supply: XLR3F
Weight 460 g
Diameter 57 mm
Length 142 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



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