GFM 132
A hemispherical-pattern boundary layer microphone with a computer-designed base plate intended to avoid comb filtering. It suits live and stage recording, orchestra pits, speaker desks and bass drum placement.
- Boundary layer microphone with hemispherical polar pattern
- Computer-designed plate shape avoids comb filter effects
- 20 Hz to 20 kHz frequency range
- Transformerless circuit, 48 V phantom power
- 10 dB attenuation switch
- Supplied with wooden case and wind screen
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The GFM 132 is a pressure-transducer boundary layer microphone with a hemispherical polar pattern that stays the same across frequency. Its base plate has a shape derived from computer simulation, intended to avoid the comb-filter coloration that circular, square or rectangular plates can produce. The response is smooth for all angles of incidence, with a slight rise in the upper frequencies to help distant sources sound clear.
Typical uses include live recording in opera-house orchestra pits, theatres and on stage, as well as speaker desks, and placement inside a bass drum. Diffuse-field and free-field responses are identical, and as a pressure transducer it is insensitive to structure-borne noise and air movement. The back has non-slip pads for horizontal or inclined use, plus holes for wall suspension.
The microphone is powered by 48 V phantom power through a balanced XLR 3 F connector and uses transformerless circuitry. A 10 dB attenuation switch next to the connector protects the following input from overload. It ships with a wooden case and a wind screen.
Tekniset tiedot
- Merkki
- Neumann
- Malli
- GFM 132
- Luokka
- Studio › Mikrofonit
Audio
- Acoustical operating principle
- Pressure transducer
- Directional pattern
- Hemispherical
- Frequency range
- 20 Hz ... 20 kHz
- Sensitivity at 1 kHz into 1 kohm
- 18 mV/Pa
- Equivalent noise level, A-weighted
- 14 dB-A
- Signal-to-noise ratio, CCIR (re. 94 dB SPL)
- 70 dB
- Signal-to-noise ratio, A-weighted (re. 94 dB SPL)
- 80 dB
- Maximum SPL for THD 0.5%
- 137 dB
- Maximum SPL for THD 0.5% with preattenuation
- 147 dB
- Pre-attenuation
- 10 dB switch
Outputs
- Rated impedance
- 50 Ohms
- Rated load impedance
- 1000 Ohms
- Maximum output voltage
- 10 dBu
Connectivity
- Matching connector
- XLR 3 F
Power
- Supply voltage (P48, IEC 61938)
- 48 V ± 4 V
- Current consumption (P48, IEC 61938)
- 2 mA
Physical
- Diameter
- 213 mm
- Length
- 168 mm
- Weight
- 460 g
In the box
- Included
- Wooden case, wind screen