Neumann.Berlin U 87 Ai U 87 Ai, Polar patterns, Electrical features, Filter and attenuation, Application Hints, Delivery Range, Catalog No, Selection of Accessories

U 87 Ai

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 selected characteristic.

Electrical features

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 lev- els, and an improved S/N ratio of 3 dB.

Filter and attenuation

A switch located at the rear attenuates the sensitivity by 10 dB. When this switch is activat- ed, the microphone accepts

sound pressure levels up to 127 dB (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 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

40cm, the figure-8 characteristic even at a di- stance of 15 to 20 cm.

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 experimentation to gain maximum use from this microphone.

Delivery Range

Microphone U 87 Ai (mt) in Wooden box

Stereo set: 2x U 87 Ai (mt) Microphone, 2x EA 87 (mt) Elastic suspension, 2x Dust cover, Aluminium case

Catalog No.
U 87 Ai ...........................................................	ni ..........	007022
U 87 Ai mt ...................................................	blk .......	007023
U 87 Ai Stereo set ..................................	ni ..........	008505
U 87 Ai mt Stereo set ..........................	blk .......	008506
Selection of Accessories
Battery supply, BS 48 i ........................	blk .......	006494
Power supply, N 248 EU ..................	blk .......	008537
Power supply, N 248 US ...................	blk .......	008538
Power supply, N 248 UK ..................	blk .......	008539
Auditorium hanger, MNV 87 ...........	ni ..........	006804
Auditorium hanger, MNV 87 mt ...	blk .......	006806
Elastic suspension, EA 87 .................	ni ..........	007297
Elastic suspension, EA 87 mt .........	blk .......	007298
Stand mount swivel, SG 367 mt ...	blk .......	006145
Popscreen, PS 20 a ................................	blk .......	008488
Windscreen, WS 87 ...............................	blk .......	006753
Microphone cable, IC 4 mt ................	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