
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
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- U 47 fet (1972)
- U 48
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- U 87 Anniversary Set
- U 87 i
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- GFM 132
Acoustical operating principle | Pressure transducer |
Directional Pattern | Hemispherical |
Frequency Range | 20 Hz ... 20 kHz |
Sensitivity at 1 kHz into 1 kohm | 18 mV/Pa |
Rated Impedance | 50 Ohms |
Rated load impedance | 1000 Ohms |
Equivalent noise level, A-weighted 1 | 14 dB-A |
Maximum SPL for THD 0.5% 2 | 137 dB |
Maximum SPL for THD 0.5% with preattenuation 3 | 147 dB |
Signal-to-noise ratio, CCIR (re. 94 dB SPL) 4 | 70 dB |
Signal-to-noise ratio, A-weighted (re. 94 dB SPL) 5 | 80 dB |
Maximum output voltage | 10 dBu |
Supply voltage (P48, IEC 61938) | 48 V ± 4 V |
Current consumption (P48, IEC 61938) | 2 mA |
Matching connector | XLR 3 F |
Weight | 460 g |
Diameter | 213 mm |
Length | 168 mm |
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
3)
measured as equivalent el. input signal
4)
according to IEC 60268-1; CCIR-weighting acccording to CCIR 468-3, quasi peak; A-weighting according to IEC 61672-1, RMS
5)
according to IEC 60268-1; CCIR-weighting acccording to CCIR 468-3, quasi peak; A-weighting according to IEC 61672-1, RMS
Acoustical operating principle | Pressure transducer |
Directional Pattern | Hemispherical |
Frequency Range | 20 Hz ... 20 kHz |
Sensitivity at 1 kHz into 1 kohm | 18 mV/Pa |
Rated Impedance | 50 Ohms |
Rated load impedance | 1000 Ohms |
Equivalent noise level, A-weighted 1 | 14 dB-A |
Maximum SPL for THD 0.5% 2 | 137 dB |
Maximum SPL for THD 0.5% with preattenuation 3 | 147 dB |
Signal-to-noise ratio, CCIR (re. 94 dB SPL) 4 | 70 dB |
Signal-to-noise ratio, A-weighted (re. 94 dB SPL) 5 | 80 dB |
Maximum output voltage | 10 dBu |
Supply voltage (P48, IEC 61938) | 48 V ± 4 V |
Current consumption (P48, IEC 61938) | 2 mA |
Matching connector | XLR 3 F |
Weight | 460 g |
Diameter | 213 mm |
Length | 168 mm |
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
3)
measured as equivalent el. input signal
4)
according to IEC 60268-1; CCIR-weighting acccording to CCIR 468-3, quasi peak; A-weighting according to IEC 61672-1, RMS
5)
according to IEC 60268-1; CCIR-weighting acccording to CCIR 468-3, quasi peak; A-weighting according to IEC 61672-1, RMS
Choose other product
- CMV 3
- D-01
- GFM 132
- KFM 100
- KH 805
- KK 120 + KM D
- KK 131 + KM D
- KK 133 + KM D
- KK 143 + KM D
- KK 145 + KM D
- KK 183 + KM D
- KK 184 + KM D
- KK 185 + KM D
- KM 120
- KM 130
- KM 131
- KM 140
- KM 143
- KM 145
- KM 150
- KM 253
- KM 254
- KM 256
- KM 53
- KM 54
- KM 56
- KM 64
- KM 66
- KM 73
- KM 74
- KM 75
- KM 76
- KM 83
- KM 84
- KM 85
- KM 86
- KM 88
- KMA (1968)
- KMF 4 i
- KML
- KMR 81 D
- KMS 104 D
- KMS 105 D
- KMS 140
- KMS 150
- KMS 84
- KMS 85
- KTM
- KU 80
- KU 81
- M 269 c
- M 49
- M 50
- MM 2
- MM 3
- MM 5
- QM 69
- RSM 190 i
- RSM 191 A Set
- SM 2
- SM 23 c
- SM 69
- SM 69 fet
- SRM 64
- SRM 84
- TLM 103 D
- TLM 127
- TLM 170
- TLM 50
- U 47
- U 47 fet (1972)
- U 48
- U 497
- U 64
- U 67 (1960)
- U 77
- U 87 Anniversary Set
- U 87 i
WARNING (for California residents only): This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects and other reproductive harm. For more information go to: www.p65warnings.ca.gov.