Beschreibung
Neumann U 87 Ai mt Large-diaphragm condenser microphoneNeumann 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.ScopeU 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 propertiesThe 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 patternsThe 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 PropertiesThe 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 attenuationA 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 microphonePressure gradient transducer with double membrane capsuleThe classic studio microphoneSwitchable low cut filterThree switchable polar patterns: omnidirectional, cardioid, figure eightSwitchable 10 dB pre-attenuationAs main and support microphone in a variety of situations and appropriateThe technical data of the U 87 AI:Operating principle pressure gradientPolar pattern: omnidirectional, cardioid, figure eightFrequency range 20 Hz .. 20 kHzSensitivity at 1 kHz into 1 kohm 20/28/22 mV / PaNominal impedance 200 ohmsRated load impedance 1 kOhmEquivalent noise level, CCIR 26/23/25 dBEquivalent SPL, A-15/12/14 dB-ANoise ratio, CCIR (rel. 94 dB SPL) 68/71/69 dBNoise ratio, A-weighted (rel. 94 dB SPL) 79/82/80 dBSPL for THD 0,5% 117 dB (cardioid),Maximum SPL for THD 0.5% with 127 dB attenuationMaximum output voltage 390 mVDynamic range of the amplifier (A-weighted) 105 dBSupply voltage (P48, IEC 61938) 48 V ± 4 VCurrent consumption (P48, IEC 61938) 0.8 mAMatching connector XLR3FWeight 500 gramsDiameter 56 mmLength 200 mm For more information, please visit this products webpage
