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Neumann U87 Ai - Large Diaphragm Switchable Condenser Microphone
The U 87 is probably the best known and most widely used Neumann studio microphone. It is equipped with a large dual-diaphragm capsule with three directional patterns: omnidirectional, cardioid and figure-8. These are selectable with a switch below the headgrille. A 10 dB attenuation switch is located on the rear. It enables the microphone to handle sound pressure levels up to 127 dB without distortion. Furthermore, the low frequency response can be reduced to compensate for proximity effect. The U 87 Ai is used as a main microphone for orchestra recordings, as a spot mic for single instruments, and extensively as a vocal microphone for all types of music and speech.
The dual-diaphragm capsule is elastically mounted and protected by a large headgrille. A switch below the headgrille selects the three directional patterns: omnidirectional, cardioid and figure-8. A window above this switch shows the symbol of the selected characteristic. The letter A in the name indicates a more recent generation, as compared to the U 87 i microphones that were built from 1967 to 1986. Modifications apply to the electronic components of the microphone only; the capsule remained unchanged. The present-day circuitry increases the operational headroom of the U 87 Ai by supplying the bias voltages for the capsule through a reduced resistance. The result is a higher sensitivity of 10 dB for identical sound pressure levels, and an improved S/N ratio of 3 dB. The U87 Ai comes with a wooden box and is available in either nickel or black - please specify upon ordering.
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Specifications Recommended Applications
- For universal use
- The classical studio mic for vocalists (soloists and background vocalists)
- Announcer's mic for broadcasting, dubbing, voice-over
- Overhead
- Spot mic for wind instruments, strings (especially cello and double bass), piano, percussion
- Note: To record instruments with very high sound pressure levels Neumann recommend their mics with TLM circuitry
Technical Data
- Acoustical operating principle: Pressure gradient transducer
- Directional pattern: Omnidirectional, cardioid, figure-8 plus
- Frequency range: 20 Hz ... 20 kHz
- Sensitivity at 1 kHz into 1 kohm: 20/28/22 mV/Pa1)
- Rated impedance: 200 ohms
- Rated load impedance: 1 kohms
- Equivalent noise level, CCIR2): 26/23/25 dB1)
- Equivalent noise level, A-weighted2): 15/12/14 dB-A1)
- Signal-to-noise ratio, CCIR2) (rel. 94 dB SPL): 68/71/69 dB1)
- Signal-to-noise ratio, A-weighted2) (rel. 94 dB SPL): 79/82/80 dB1)
- Maximum SPL for THD 0.5%3): 117 dB (cardioid)
- Maximum SPL for THD 0.5% with preattenuation3): 127 dB
- Maximum output voltage: 390 mV
- Dynamic range of the microphone amplifier (A-weighted): 105 dB
- Supply voltage (P48, IEC 61938): 48 V ± 4 V
- Current consumption (P48, IEC 61938): 0.8 mA
- Matching connectors: XLR3F
- Weight: 500 g
- Diameter: 56 mm
- Length: 200 mm
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