Large Diaphragm Condenser Microphone (Nickel)
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The black U 89 i Large Diaphragm
Condenser Microphone from Neumann is a studio microphone for multiple
applications. The head grille protects a dual-diaphragm capsule and a
rotary switch below the head grille selects from five different polar
patterns.
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.
This
microphone has omnidirectional, cardioid, figure-8, hypercardioid, and
wide-angle cardioid characteristics. 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.
The microphone is addressed
from the front. 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°. 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 is elastically mounted to avoid any
structure borne noise that could interfere with its operation.
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 head grille. This filter suppresses low frequency
interference, yet maintains an even frequency response for close-up
sound sources. A steep high-pass filter in the LIN position prevents the
output transformer of the microphone from being overloaded due to
undesired subsonic frequencies.
All exposed surfaces of the
microphone capsule, including the diaphragms, are at ground potential.
This makes them highly immune to electrical and atmospheric interference
and contamination through microscopic dust particles.
Features:
-Operating Principle Pressure Gradient
-Transducer Condenser
-Polar Pattern Cardioid, Figure-8, Hypercardioid, Omnidirectional, Wide-Angle Cardioid
-Frequency Range 20 Hz to 20 kHz
-Signal to Noise Ratio 66 dB CCIR
-77 dB A-Weighted
-Equivalent Noise Level 28 dB CCIR
-17 dB A-Weighted
-Maximum SPL 134 dB SPL
-140 dB SPL
-Pad 6 dB
-Impedance 150 Ohms
-Load Impedance 1 kOhms
-Sensitivity 8 mV/Pa at 1 kHz into 1 kOhms