The amplifier accepts sound pressure levels up to 134 dB without distortion. This figure can be increased to 140 dB. An additional rotary switch activates a filter that changes the low frequency response either below 80 Hz or 160 Hz frequency.
As a result the U 89 i has a very even diffuse-field response for all polar patterns. This is important in a reverberant environment when more reflections arrive at the microphone capsule. The acoustic information is not affected in its tonal quality when recorded by the microphone.
This characteristic is achieved without resorting to corrective resonance effects.
The capsule it is elastically mounted to avoid any structure borne noise that could interfere with its operation.
A low frequency roll-off at 80 Hz or 160 Hz can be activated with another rotary switch below the headgrille. This filter suppresses low frequency interference, yet maintains an even frequency response for close-up sound sources, for example, when proximity effect could adversely affect the program material.
A steep high-pass filter in the LIN position prevents the output transformer of the microphone from being overloaded due to undesired subsonic frequencies.
- Variable large diaphragm microphone
- Pressure-gradient transducer with double membrane capsule
- Five directional characteristics: omni, wide angle cardioid, cardioid, hypercardioid, figure-8
- Thereby most versatile in all recording situations
- Two-stage roll-off filter
- Switchable 6 dB pre-attenuation
- Extended frequency range in comparison to U 87 Ai
- Acoustical operating principle Pressure gradient transducer
- Directional pattern Omnidirectional, wide angle, cardioid, hypercardioid, figure-8
- Frequency range 20 Hz ... 20 kHz
- Sensitivity at 1 kHz into 1 kohm 8 mV/Pa
- Rated impedance 150 ohms
- Rated load impedance 1000 ohms
- Equivalent SPL CCIR 468-3 28 dB
- Equivalent SPL DIN/IEC 651 17 dB-A
- S/N ratio CCIR 468-3 66 dB
- S/N ratio DIN/IEC 651 77 dB
- Maximum SPL for THD 0.5% 134 dB
- Maximum SPL for THD 0.5% with preattanuation 140 dB
- Maximum output voltage 800 mV
- Dynamic range of the microphone amplifier DIN/IEC 651 117 dB
- Supply voltage 48 V +/- 4 V
- Current consumption 0.8 mA
- Matching connector XLR 3F
- Weight 400 g
- Diameter 46 mm
- Length 185 mm
- EA 89 Shock Mount not Included.