Boundary Layer Microphone

GFM 132

Neumann’s first and only boundary layer microphone. The GFM 132 was designed using computer simulations: The unique shape of the base plate avoids comb filter effects.

GFM 132
GFM 132
Diameter 213 mm
Length 168 mm
Weight 460 g
Current consumption (P48, IEC 61938) 2 mA
Directional Pattern Hemispherical
Frequency Range 20 Hz ... 20 kHz
Matching connector XLR 3 F
Rated Impedance 50 Ohms
Supply voltage (P48, IEC 61938) 48 V ± 4 V
Acoustical operating principle Pressure transducer
Maximum output voltage 10 dBu
Rated load impedance 1000 Ohms
Maximum SPL for THD 0.5% 137 dB
Equivalent noise level, A-weighted 14 dB-A
Sensitivity at 1 kHz into 1 kohm 18 mV/Pa
Maximum SPL for THD 0.5% with preattenuation 147 dB
Signal-to-noise ratio, CCIR (re. 94 dB SPL) 70 dB
Signal-to-noise ratio, A-weighted (re. 94 dB SPL) 80 dB
Signal-to-noise ratio, CCIR (re. 94 dB SPL) 70 dB

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