Microphone Neumann U 87 Ai Large Diaphragm Multipattern Condenser Microphone

Equipment characteristics were generated using automatic translation from the seller’s website.

Neumann U 87, probably Neumann's best known and most widely used studio microphone. It is equipped with a large dual-diaphragm capsule with three polar patterns: omnidirectional cardioid and figure eight. They can be selected using the switch under the grille. Attenuation switch 10 dB is located at the rear. This allows the microphone to withstand sound pressure levels up to 127 dB without distortion. In addition, the low frequency response can be reduced to compensate for the proximity effect. Acoustic characteristics The U 87 Ai faces the front and is marked with the Neumann logo. Cardioid and figure-eight frequency response is very smooth for frontal sound incidence even in the upper frequency range. The microphone can be used very close to the sound source At the same time, the sound does not become unnaturally harsh. High-pass filter significantly reduces interference at infrasound and low frequencies. Directional pattern Double diaphragm capsule is elastically mounted and protected by a large grille. A switch under the grille allows you to select three polar patterns: omnidirectional cardioid and figure eight. The window above this switch displays the symbol for the selected characteristic. Electrical characteristics The letter A in the name indicates a more recent generation compared to the U 87 i microphones produced from 1967 to 1986. The changes affect only the electronic components of the microphone; the capsule remained unchanged. The modern circuit increases the operating margin of U 87 Ai by applying a bias voltage to the capsule through reduced resistance. The result is 10 d
B higher sensitivity at the same sound pressure levels and an improved signal-to-noise ratio by 3 dB. Filter and attenuation switch located at the rear reduces sensitivity by 10 dB. When this switch is activated the microphone perceives sound pressure levels up to 127 d
B (equivalent to a sound pressure of 45 Pa) without distortion. An additional switch on the back allows you to change the microphone cutoff frequency. This reduces low-frequency interference directly at the microphone amplifier input. This setting also compensates for the inevitable bass boost which occurs with all pressure gradient sensors when they are used at close range (proximity effect). Cardioid pattern maintains smooth frequency response from 30 to 40 cm , figure-of-eight characteristic - even at a distance of 15 to 20 cm.