|
Neumann U 89 i Switchable Studio Microphone |
|
Product Code: U89i
|
The U 89* is a
studio microphone for universal applications. The headgrille protects a
dual-diaphragm capsule. A rotary switch below the headgrille selects from five
different polar patterns. Therefore the microphone can be adapted easily to
large sound sources, and those that are spread wide apart, or to sound sources
to be recorded at a greater distance.
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.
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, we have 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. |
�
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 |
1 kohms |
| Equivalent
noise level, CCIR1) |
28 dB |
| Equivalent
noise level, A-weighted1) |
17 dB-A |
|
Signal-to-noise ratio, CCIR1) (rel. 94 dB SPL) |
66 dB |
|
Signal-to-noise ratio, A-weighted1) (rel. 94 dB SPL) |
77 dB |
| Maximum SPL
for THD 0.5%2) |
134 dB |
| Maximum SPL
for THD 0.5% with preattenuation2) |
140 dB |
| Maximum
output voltage |
800 mV |
| Supply
voltage (P48, IEC 61938) |
48 V � 4 V |
| Current
consumption (P48, IEC 61938) |
0.8 mA |
| Matching
connector |
XLR3F |
| Weight |
400 g |
| Diameter |
46 mm |
| Length |
185 mm |
|
|
|
|
|
|
| |
|
|
