This is a factory-matched stereo pair of two Neumann U 87 Ai large-diaphragm condenser microphones. Each microphone comes with an EA 87 suspension mount, and the set is supplied in a mic briefcase. The finish is nickel.
Each U 87 Ai has a dual-diaphragm capsule that is elastically mounted and protected by a large headgrille. A switch below the headgrille selects omnidirectional, cardioid or figure-8 pickup, and a window above the switch shows the selected pattern. The microphone is addressed from the front, marked with the Neumann logo.
Two switches on the rear control the signal. One applies a 10 dB attenuation, which lets the microphone handle sound pressure levels up to 127 dB without distortion. The other sets a low-frequency cutoff that reduces subsonic and low-frequency interference and compensates for proximity effect. The "A" in the name marks updated electronics compared with the U 87 i built from 1967 to 1986. The capsule is unchanged, and the circuitry gives higher sensitivity and an improved signal-to-noise ratio.
- Type
- 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
- 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
- 10 dB pre-attenuation switch
- Low cut
- Switchable low-frequency roll-off to reduce proximity effect
- Power
- 48 V phantom (±4 V)
- Output impedance
- 200 ohms