Product Description

Applications

The U 89 i is similar in appearance to the U 87.  It is of smaller size, and lighter weight.  It features five instead of three directional characteristics and a higher maximum sound pressure level which make this microphone easier adaptable to different applications.

Polar Patterns

In addition to the usual directional polar patterns: omnidirectional, cardioid, and figure-8, Neumann has added a hypercardioid and wide-angle cardioid characteristic.  When compared to the standard cardioid pattern, the hypercardioid characteristic suppresses sound from the side more efficiently.  The wide-angle polar pattern is especially useful to record large sound sources.

Acoustic Features

The microphone is addressed from the front, marked with the Neumann logo.  The large diaphragm capsule has a very smooth frequency response for all polar patterns over a wide acceptance angle.  The frequency response curves are flat up to 10 kHz within a pickup angle of ± 100°.

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.

Filter and Attenuation

The amplifier handles sound pressure levels up to 134 dB without distortion.  With a self noise level of 17 dB (A-weighted) the total dynamic range is 117 dB.  Maximum sound pressure level is 140 dB when the – 6 dB rotary switch is in the ON position.

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.

Operational Safety

All exposed surfaces of the microphone capsule, including the diaphragms, are at ground potential.  This technology makes them highly immune to electrical and atmospheric interference and contamination through microscopic dust particles.

Features:

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

 
Specifications:

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: 1 kohms

Equivalent noise level, CCIR*: 28 dB

Equivalent noise level, A-weighted*: 17 dB-A

Signal-to-noise ratio, CCIR* (rel. 94 dB SPL): 66 dB

Signal-to-noise ratio, A-weighted* (rel. 94 dB SPL): 77 dB
*According to IEC 60268-1; CCIR-weighting acccording to CCIR 468-3, quasi peak; A-weighting according to IEC 61672-1, RMS

Maximum SPL for THD 0.5%*: 134 dB

Maximum SPL for THD 0.5% with preattenuation*: 140 dB
**Measured as equivalent el. input signal

Maximum output voltage  800 mV

Dynamic range of the microphone amplifier (A-weighted)  117 dB

Supply voltage (P48, IEC 61938)  48 V ± 4 V

Current consumption (P48, IEC 61938)  0.8 mA

Matching connector: 3-pin XLR-F

Weight: 400 g

Diameter: 46 mm

Length: 185 mm