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M-149Tube / 钮曼 Neumann 电子管电容话筒 9-拾音指向N 149电源 EA 170防震架话筒电缆
类别：录音话筒
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详细介绍：
纽曼公司30年来出品的首支电子管麦克风，其核心部分是k49双振膜传感器，它继袭了该模式的前身u47和m49的特点，能带给听众电子管话筒传递出的温暖感觉，同时其清晰与准确程度也是不容质疑的。无变压器电路输出设计使其能配合很长的话筒电线，但却不会影响到声音质量。
m149 tube有9种指向可供选择，除了标准的全向，半球型，心型，过心型和8字型外，还包括同时拥有它们某些特点的中间型，让录音更加随心所欲。其内部杂音低，特别适合独奏，尤其是弦乐、风琴、和钢琴现场使用。
特点：
常用的电子管录音话筒；
有继承自u47和m49的带大振膜传感器的压力梯度变频器；
无变压器电路；
极低的自身杂音；
7 fold 可调节的低频滚切
技术指标
·声音操作原理：压力梯度传感器
·指向性：全向，半球型，心型，过心型和8字型
·频率范围：20hz-20khz
·灵敏度：34/37/62mv/pa*
·输出阻抗：50Ω
·负载阻抗：1000Ω
·灵敏度（ccir 468-3）：28/25/23db*
·灵敏度（din/iec 651）：16/13/11db*
·信噪比（ccir 468-3）：66/69/71db*
·信噪比（din/iec 651）：78/81/83db*
·声压级（电子管特性）：
·小于0.5%thd(<5%thd)：120（136）db
·最大输出电压：18dbu
·麦克风传感器动态范围：
·din/iec 651（小于0.5% thd）：101（121）db
·电源：电源供应n149a
·麦克风连接：din 8f
·麦克风连接电源：xlf 3f
·重量：730克
·直径：70毫米
·长度：201毫米
The M 149 Tube* is a variable dual-diaphragm microphone. The K 49 capsule – well-known from the legendary U 47 and M 49 microphones – is followed by a tube functioning as an impedance converter. In contrast to earlier concepts – utilizing a transformer – the tube is complemented with a transformerless output circuit design. The M 149 Tube can thus feed long microphone cables without any coloration.
Two slide switches are located below the large, acoustically very open headgrille. The switch at the front allows selection one of nine directional patterns. The slide switch at the rear operates a seven-step high pass filter. It allows a very fine adjustment of the cut-off frequency.
Applications
There are nine polar patterns to choose from, making this microphone an ideal choice for a wide range of recording situations.
As its ancestors, the M 149 Tube is a superb vocalist microphone, not only because of the capsule, but also due to its modern circuitry, characterized by extremely low noise level.
Acoustic features
The M 149 Tube is addressed from the front, marked with the Neumann logo. Also on the front is the switch for the selection of the polar patterns.
The capsule is mounted elastically inside the headgrille to eliminate structure borne noise. The surface below the capsule is shaped like a cone to disperse any reflected sound from the acoustic upper half space. This avoids any interference with the primary sound arriving at the capsule directly.
A large headgrille surrounds the capsule. It is acoustically very open and therefore increases the sonic realism.
Polar patterns
The polar pattern switch selects one of nine directional patterns: omnidirectional, wide-angle-cardioid, cardioid, hypercardioid, figure-8, and one additional intermediate pattern between each major position.
Electrical features
The circuit of the M 149 Tube microphone has been developed to exceed traditional designs. We have selected a modern tube (triode) and combined its exceptional transmission characteristics with the advantages of our proven transformerless output circuit.
The aim was to provide a more controlled environment for the audio signal on its path from the capsule to the output section.
The final stage is an integrated amplifier, especially designed for such applications. It features very low distortion (THD < 0.002 % at ± 10 V), very low self-noise, and high output current capability.
As a result, the tube circuit is completely decoupled from the microphone output and its characteristic response curve will be unaffected by very high signal levels or varying load conditions.
The lower output impedance and higher output current capability allow cable lengths up to 300 m (1000 feet) without any degradation of the audio signal.
The tube amplifier changes the high impedance of the capsule and adds 10 dB of gain to the audio signal, providing optimum operating specifications. The wide dynamic range is impressive, as peak output can be ±10 V, at 20 mA.
The ideal operating point of the tube is maintained throughout its entire life expectancy. Plate current and filament voltage are constantly regulated. A sensor circuit monitors and compensates for any voltage drop across the microphone cable. The tube is heated up slowly through inverse current limiting to guarantee long life. Optimum operating conditions are reached within a very short time.
Filter
A seven-position slide switch is located on the back of the microphone. It selects a high-pass filter, advancing in half-octave steps between 20 Hz and 160 Hz (-3dB). This filter is useful to suppress rumble from air-conditioning and in windy situations.
In addition, the filter provides an effective tool to control the audio signal when the microphone is used at close distance and therefore proximity effect alters the program material.
Delivery Range
The specifically designed N 149 A power supply unit feeds the M 149 Tube through an 8-core cable. The output connector for the audio signal is a 3-pin XLR. The output signal is balanced.
The microphone comes as a set in an attractive aluminium case, together with the 8-core microphone connecting cable, the N 149 A power supply with plug-in mains unit, the EA 170 full elastic microphone suspension and a dust cover.
·The design of the microphone is a registered design of the Georg Neumann GmbH in certain countries.
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