Variable large diaphragm microphone, Switchable low frequency roll-off

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The nickel U 87 Ai Condenser Microphone from Neumann is a large dual-diaphragm condenser microphone. It features three directional patterns, including omnidirectional, cardioid and figure-8. These are selectable with a switch below the head grille and the window above this switch shows the symbol of the selected characteristic. 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. 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 microphone for single instruments, and extensively as a vocal microphone for all types of music and speech.

The U 87 Ai is addressed from the front. The frequency response of the cardioid and figure-8 directional characteristics are very flat for frontal sound incidence, even in the upper frequency range. The microphone can be used very close to a sound source without the sound becoming unnaturally harsh. By means of a high-pass filter, interference through subsonic and low frequencies are reduced.

The circuitry increases 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.

A switch located at the rear attenuates the sensitivity by 10 dB. When this switch is activated, the microphone accepts sound pressure levels up to 127 dB (equivalent to a sound pressure of 45 Pa) without distortion.

An additional switch at the rear allows to change the microphone's cutoff frequency. This reduces low frequency interference directly at the input of the microphone amplifier. This setting also compensates for the unavoidable bass boost that occurs with all pressure gradient transducers when they are used at close distance (proximity effect).

The cardioid characteristic maintains a smooth frequency response at a distance of 30 to 40 cm, and the figure-8 characteristic at a distance of 15 to 20 cm.

Key Features

  • Variable large diaphragm microphone
  • Pressure-gradient transducer with double membrane capsule
  • Omnidirectional, cardioid, and figure-8 characteristics
  • Switchable low frequency roll-off
  • Switchable 10 dB pre-attenuation
  • Great as a main or as a support microphone


Operating Principle
Pressure Gradient
Polar Pattern
Cardioid, Figure 8, Omnidirectional
Frequency Range
20 Hz to 20 kHz
Signal to Noise Ratio
71: dB CCIR
69: dB CCIR
68: dB CCIR
82: dB A-Weighted
80: dB A-Weighted
79: dB A-Weighted
Equivalent Noise Level
23 dB CCIR
25 dB CCIR
26 dB CCIR
12 dB A-Weighted
14 dB A-Weighted
15 dB A-Weighted
Maximum SPL
117 dB SPL 0.5%
127 dB SPL 0.5% with 10 dB Pad Engaged
200 ohms
Load Impedance
1 kOhms
28 mV/PA @ 1 kHz into 1 kOhms
22 mV/PA @ 1 kHz into 1 kOhms
20 mV/PA @ 1 kHz into 1 kOhms
Power Requirements
48 V+/- 4 V
Yes, 10 dB
Output Connectors
3-Pin XLR
Operating Current Consumption
7.87 " (200 mm )
2.20" (56 mm)
1.10 lb (500 g)
Neumann U 87 Ai Condenser Microphone (Studio Set, Nickel)
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