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U-89i / 钮曼 Neumann 大震膜话筒 5-拾音指向
类别：录音话筒
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详细介绍：
适用于演播室的优秀录音话筒neumann u89i。其外观与u87相似，但型号稍小，重量稍轻，金属头罩为双振膜传感器提供保护，在金属头罩下面的旋钮可以选择不同的指向性。
除了通常的全向、心型、8字型三种指向性之外，还增加了超心型和半球型两种指向性，与标准的心型相比，超心型能更有效控制声音，半球型则尤其适用于大声源的录音，因此u89i能够轻松地适应大声源、那些传播范围大、或需在远距离录音的声源。它还拥有更高的声压标准，这使其能轻松适应不同设备的要求，可在风琴，弦乐器，钢琴的演出现场使用。
特点 ：
·可变的大振动膜录音话筒；
·带双振膜传感器的压力梯度传感器，对不同方向的频率响应非常平滑，频率反应曲线灵敏度在正负100度之间平坦达10hz，这一点在有回音反射的环境中尤其重要，并且此声音信息在用话筒录音时不会影响音质.
五个指向特点：全向，半球型，心型，超心型和8字型；
可处理高达134db的声压而不会产生变音，它的总动态范围可达117db，有17db的自身杂音，当-6db的旋钮打开时最大声压可达140db，用头罩下面的第三个旋钮可使它在80hz或160hz间的低频切取工作。位于lin里的高通滤波器会防止话筒的输出转换器负荷过重的低速频率；与u87ai相比较延展频率范围更广。
话筒的所有外表，包括振动膜，都有保护层，这项技术使它们免受电子和大气的干扰及污染，延长其使用寿命；
适用于各种录音条件
技术指标
·声音工作原理：压力梯度传感器
·指向性：全向型，半球型，心型，超心型，8字型
·频率范围：20hz--20khz
·灵敏度（1khz-1kΩ）：8mv/pa
·输出阻抗：150Ω
·负载阻抗：1000Ω
·灵敏度（ccir 468-3）：28db
·灵敏度（din/iec 651）：17db-a
·s/n比（ccir 468-3）：66db
·s/n比（din/iec 651）：77db
·最大声压级（thd小于0.5%）：134db
·最大声压级（thd小于0.5%，预衰减）：140db
·最大输出电压：800mv
·传感器din/iec 651动态范围：117db
·供应电压：48v+4v
·电流：0.8ma
·话筒连接：xlf3f
·重量：400克
·直径：46毫米
·长度：185毫米
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.
·The design of the microphone is a registered design of the Georg Neumann GmbH in certain countries.
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