The Neumann U 87 Ai is a large-diaphragm condenser microphone with a dual-diaphragm capsule. A switch below the headgrille selects one of three polar patterns: omnidirectional, cardioid or figure-8. A window above the switch shows the selected pattern. The capsule is elastically mounted and protected by a large headgrille.
The Ai version keeps the original capsule and has updated electronics. Lower-resistance bias voltage to the capsule gives 10 dB higher sensitivity and a 3 dB better signal-to-noise ratio. Two switches on the rear control a 10 dB attenuation pad and a low-frequency roll-off. The pad lets the microphone handle sound pressure levels up to 127 dB without distortion. The roll-off reduces low-frequency interference and compensates for proximity effect.
The microphone is addressed from the front, marked with the Neumann logo. The cardioid pattern keeps a smooth frequency response at 30 to 40 cm. The figure-8 pattern does so at 15 to 20 cm. It is used as a vocal microphone, as a main microphone for orchestra recordings and as a spot microphone for single instruments, in studio, broadcast, film and television work. This Studio Set comes with a shock mount, a windscreen and a 25 ft. microphone cable, in a nickel finish.
- Transducer
- Pressure gradient condenser
- Polar patterns
- Cardioid, omnidirectional, figure-8
- Frequency response
- 20 Hz - 20 kHz
- Dynamic range
- 115 dB (A-weighted), typical
- Signal-to-noise ratio
- 82 dB cardioid, 79 dB omnidirectional, 80 dB figure-8 (A-weighted)
- Max input level
- 117 dB at 1 kHz, 0.5% THD (127 dB with pad)
- Pad
- Switchable, -10 dB preattenuation
- Low-cut
- Switchable low-frequency roll-off to reduce proximity effect
- Power