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U87Ai
Application Hints
•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 we recommend our mics with
TLM circuitry
These are just some of the most common
applications. We recommend additional experimen-
tation to gain maximum use from this microphone.
Delivery Range
Microphone U87Ai (mt) in Wooden box
Stereo set:Stereo set:
Stereo set:Stereo set:
Stereo set: 2x U87Ai (mt) Microphone, 2x
EA87(mt) Elastic suspension, 2x Dust cover,
Aluminium case
Catalog No.
U 87 Ai...........................................................ni..........007022
U 87 Ai mt...................................................blk.......007023
U87AiStereo set..................................ni..........008505
U87AimtStereo set..........................blk .......008506
Selection of Accessories
Battery supply, BS48 i........................blk .......006494
Power supply, N248 EU..................blk .......008537
Power supply, N248 US...................blk .......008538
Power supply, N248 UK..................blk .......008539
Auditorium hanger, MNV87...........ni..........006804
Auditorium hanger, MNV87 mt...blk .......006806
Elastic suspension, EA87.................ni ..........007297
Elastic suspension, EA87 mt.........blk .......007298
Stand mount swivel, SG87..............blk .......008619
Popscreen, PS20a................................blk .......008488
Windscreen, WS87...............................blk .......006753
Microphone cable, IC4mt................blk .......006557
A complete survey and detailed descriptions of all
accessories are contained in the accessories
catalog.
Meaning of color codes: blk = black, ni = nickel
Polar patterns
The dual-diaphragm capsule is elastically
mounted and protected by a
large headgrille.
A switch below the headgrille
selects the three directional
patterns: omnidirectional, car-
dioid and figure-8.
A window above this switch
shows the symbol of the se-
lected characteristic.
Electrical features
The letter A in the name indicates a more re-
cent generation, as compared to the U 87 i mi-
crophones that were built from 1967 to 1986.
Modifications apply to the electronic compo-
nents of the microphone only; the capsule re-
mained unchanged.
The present-day circuitry increases the opera-
tional headroom of the U87 Ai by supplying
the bias voltages for the capsule through a re-
duced resistance. The result is a higher sensi-
tivity of 10 dB for identical sound pressure lev-
els, and an improved S/N ratio of 3 dB.
Filter and attenuation
A switch located at the rear attenuates the sen-
sitivity by 10 dB. When this switch is activat-
ed, the microphone accepts
sound pressure levels up to
127dB (equivalent to a sound
pressure of 45 Pa) without dis-
tortion.
An additional switch at the rear
allows to change the micro-
phone's cutoff frequency. This
reduces low frequency inter-
ference 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, the figure-8 characteristic even at a di-
stance of 15 to 20 cm.