Neumann U 87 Ai mt

Neumann U 87 Ai mt Large-diaphragm condenser microphone

Neumann U 87 AI This is probably best known and most widely used Neumann studio microphone. It is with a large dual-diaphragm capsule with three directional patterns: omnidirectional, cardioid and equipped to care, the switch of the capsule is selected to be a head about.

A switch located on the rear a 10 dB attenuation. It enables the microphone to 127 dB sound pressure levels without distortion.

Furthermore, frequency response can be lowered into the depths in order to compensate for proximity effect eg.

Scope
U 87 Ai condenser microphone is a large diaphragm microphone switchable, which by its transmission characteristics, various switch options and its pleasing shape characterized.
It is for a large number of applications in radio, TV, film and music recording recording equally well suited. In orchestral recording, it becomes the main microphone and as a support microphone for individual instruments as used, but mainly as a vocal microphone in all music genres.

Acoustic properties
The direction is sideways, with the front name plate is characterized by.
The frequency response for the cardioid and figure eight in the upper audio range for frontal sound incidence practically linear.
This allows the microphone and a small distance from the sound sources are used in special, without a sharp sound unnatural impression results.
As a measure against a high-pass filter diminishes ambient noise sound.

Polar patterns
The elastically mounted double diaphragm capsule is surrounded by a large wire basket. A switch below the basket can be directional patterns: omnidirectional, cardioid or eight set. A window above shows the setting in symbols.

Electrical Properties
The addition of point A, the name suggests in a modified embodiment compared to the 1967-1986 U 87 i microphone supplied attention to.
This amendment relates to the electrical part of the microphone, it makes the U 87 Ai by operationally of a lower supply of the capsule polarizing, the sensitivity is increased with the same sound pressure by about 10 dB and improves the S / N ratio by 3 dB.

Filter and attenuation
A switch on the back of a 10 dB attenuation can be adjusted. The microphone accepts sound pressure levels up to 127 dB (equivalent to a sound pressure of 45 Pa) without distortion to.
Pressing another button on the back, then the lower limit frequency of the microphone and Störschallwird raised at the input of microphone amplifier low-frequency attenuated.
The pressure gradient at depth unavoidable increase in close miking is so compensated that position for a kidney speaking distance 30-40 cm and in position eight for 15 to 20 cm resulting in a flat frequency response.


The features of the U 87 AI overview:
Switchable large diaphragm microphone
Pressure gradient transducer with double membrane capsule
The classic studio microphone
Switchable low cut filter
Three switchable polar patterns: omnidirectional, cardioid, figure eight
Switchable 10 dB pre-attenuation
As main and support microphone in a variety of situations and appropriate

The technical data of the U 87 AI:
Operating principle pressure gradient
Polar pattern: omnidirectional, cardioid, figure eight
Frequency range 20 Hz .. 20 kHz
Sensitivity at 1 kHz into 1 kohm 20/28/22 mV / Pa
Nominal impedance 200 ohms
Rated load impedance 1 kOhm
Equivalent noise level, CCIR 26/23/25 dB
Equivalent SPL, A-15/12/14 dB-A
Noise ratio, CCIR (rel. 94 dB SPL) 68/71/69 dB
Noise ratio, A-weighted (rel. 94 dB SPL) 79/82/80 dB
SPL for THD 0,5% 117 dB (cardioid),
Maximum SPL for THD 0.5% with 127 dB attenuation
Maximum output voltage 390 mV
Dynamic range of the amplifier (A-weighted) 105 dB
Supply voltage (P48, IEC 61938) 48 V ± 4 V
Current consumption (P48, IEC 61938) 0.8 mA
Matching connector XLR3F
Weight 500 grams
Diameter 56 mm
Length 200 mm

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