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.
| 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 |