Neumann GFM 132 Boundary Layer Microphone

GFM 132 Boundary Layer Microphone description:

Neumann's experience and history of manufacturing quality microphones is apparent in the Neumann GFM132, a professional boundary microphone intended for capturing instruments, vocals and ambience. The GFM132 features a hemispherical polar pattern that provides a wide pick up area and eliminates surface noise. Typical applications are for live recordings, such as in the orchestra pit of opera houses, theaters, and on stage. The back of the microphone has non-slip pads for its use in a horizontal or inclined position, and holes for wall suspension. It is supplied with a wooden case and a wind screen.

The triangular design is computer simulated and optimized to eliminate the filter effects commonly associated with boundary and surface mounted microphones. The result is a uniform frequency response at all angles with a boost in the upper frequencies for enhanced signal presence. A 10dB Pad switch enhances headroom and avoids distortion and noise caused by excessively loud signals. The GFM132 requires +48V phantom power and is ideal for capturing stage performances, lectures, conferences, broadcast and professional recording applications.

Features:

• Boundary layer microphone
• Pressure transducer
• Frequency independent hemispherical directional characteristic
• Identical diffuse-and free-field response
• No angle dependent coloration through patented triangular form
• No comb filter effects Insensitive to structure-borne noise
• High output capability and extremely low self noise
• Apllications include: Stage, Discussions, AB Stereo pair, Invisible spot mic for harp, cello, double bass, acoustic guitar, excellent bass response when used as main mic for drums
• Plug-on Windscreen, Microphone cable and Wooden box included

Specifications:

• Acoustical operating principle: Pressure gradient 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 SPL CCIR 468-3: 24 dB
• Equivalent SPL DIN/IEC 651: 14 dB-A
• S/N ratio CCIR 468-3: 70 dB
• S/N ratio DIN/IEC 651: 80 dB
• Maximum SPL for THD 0.5%: 137 dB
• Maximum SPL for THD 0.5% with preattanuation: 147 dB
• Maximum output voltage: 10 dBu
• Dynamic range of the microphone amplifier DIN/IEC 651: 123 dB
• Supply voltage: 48 V ± 4 V
• Current consumption: 2 mA
• Matching connector: XLR3F
• Weight: 460g
• Diameter: 213 mm
• Length: 168 mm