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BCM-705 / 钮曼 Neumann 广播电容话筒 录音麦克风
类别：录音话筒
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详细介绍：
BCM 705是Neumann广播话筒产品中推出的第二款话筒，也是Neumann推出的第一款动圈话筒。毫无经验是不行的，Neumann借鉴了Sennheiser MD 431——经典手持舞台话筒的话筒头，并对其进行了全新设计。加上采用先前推出的新产品BCM 104的话筒体，在贴上了Neumann的绿色品牌徽章后，Neumann的第一款动圈话筒BCM 705就这样诞生了。
在制造BCM 705之前，需要对原材料MD 431话筒头做一次全面的检查。无论在频响还是灵敏度方面，为了满足BCM 705更高的品质要求，都需要在原Sennheiser的基础上进行改进。为了增强对低频的响应，包围在话筒头周围的空腔需要扩大，并且要细致地对尾部输出口进行声学匹配。虽然作为一款动圈话筒，BCM 705是为贴近拾音设计的，但其对低频的响应并不因距离的加大而衰减得，因此即使离开一定的距离，BCM705也可以保持较好的、结识的低频响应。
和KMS 105和BCM 104话筒一样，BCM 705采用了相同的防风网罩设计，避免了原MD 431需要在话筒前使用防风泡沫的做法，这使BCM 705具有更强的抗风能力。为了获得更干净的声音，您也可以很简单地将防风网罩卸下来。和BCM 104一样，BCM 705还能根据用户的喜好选择不同颜色的话筒头。
最后，Neumann还对话筒头的抗震性进行了重新设计，使支架移动及手持震动对话筒的影响大大降低了。放置在防震架中的BCM 705可以使用在广播用的话筒支架上。
其在外观上和先前该公司前不久推出的bcm 104话筒一模一样，但是从其新添的“绿色”neumann标牌上，用户还是可以立即辨认出这是一款neumann动圈话筒。
为了加强低频响应，设计人员有意扩大了bcm 705振膜舱周围的空间，并将其同话筒的后输入端口进行了连接。尽管bcm 705是专门为近距离扩音设计的，但是，由于临近效应，还是会产生少许的低频效果，这使得该款话筒成为那些喜欢同话筒保持一定距离，但又希望能够产生优质、坚实低频响应的音乐人士的理想选择。
此外，bcm 705还采用了kms 105和bcm 104话筒所使用的金属丝网防“噗”罩，从而避免了像md 431那样在振膜舱前面添加一层泡沫。该防“噗”罩可以被卸下进行清洗，无需使用任何工具。其所配备的防风罩也在bcm 104基础上进行了一定的改进。
Emotion conveyed with technical perfection. This is the ideal which the Neumann microphones in the Broadcast Line have been designed to fulfill. The fine-tuning to the requirements of professional broadcast studios and the individual, functionally optimized design* ensure that these are microphones of character.
The BCM 705 is Neumann’s first dynamic microphone. The housing and headgrille are identical to those of the BCM 104; only the green logo indicates that this is something new from Neumann. The principle of reduction to the essentials can be seen in the dynamic capsule with a hypercardioid directional characteristic, specifically designed for speech reproduction at close range. Multi-level isolation from structure-borne noise ensures operation free of interference, even in a lively studio environment.
Mechanical Features
The microphone headgrille twists off easily for quick cleaning. Neumann offers optional, color-coded headgrilles so that, for reasons of hygiene, each announcer can use his or her individual headgrille. In front of the capsule, mounted on a frame holder, a fine gauze serves as a built-in popscreen.
The microphones of the Broadcast Line have an elastic mount against structure-borne noise, that is compatible with standard broadcast-segment microphone arms.
Acoustic features
The frequency response has a light treble boost, in the region from 2 kHz to 9 kHz, aiding the speech intelligibility. The bass frequency response is designed to compensate for the overemphasis of the bass caused by the proximity effect.
The integrated Pop Screen
A pop screen not only prevents the occurrence of plosive pop noises in vocal recordings, but also efficiently prevents unwanted particles, from respiratory moisture, nicotine, to food remnants, from settling on the diaphragm. The pop screen can be removed for cleaning without the use of tools.
Mounting
The preferred mode of operation is to suspend the BCM 104 or BCM 705 from a standard studio boom arm.
A thread adapter to fit different connector threads is included. In order to provide protection from structure-borne noise, both the capsule and the microphone in its mount are elastically suspended.
The optional SG 5 swivel mount allows additional angling of the microphone by +/-90 degrees.
· The design of the microphone is a registered design of the Georg Neumann GmbH in certain countries.
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