详细介绍：
听不见咝咝声的大振膜录音话筒tlm103 ！字母tlm代表“无变压器录音话筒”，在众多的neumann录音话筒上都使用了平衡无变压器电路， tlm103做到了自身低杂音和高声压电平传送，其自身杂音仅仅为7db-a/17.5db ccir，因此连最细微的声音信号也能被摸拟出来。
由u67和u87发展而来的心形指向性的传感器，则?过了声音平衡并能提供额外的阻尼信号，通过使用此指向性，背景声音被弱化到了最小状态。tlm 103 外表为光洁的镍面，银灰色彩，配件包括一个sg103旋转座和一个v形支承面轴承。tlm 103 不仅适合家庭录音或是专业电台广播，而且满足商业录音工作室的使用要求，可在风琴、弦乐器、打击乐器、吉他、鼓的演奏现场使用。
特点：
·大振膜录音话筒
·指向性：心型；
·带单振膜的压力梯度传感器，有高达约5khz的平滑频率反应，在此之上，会出现4db的平坦增加；
·大金属丝网眼头置保护传感器免受爆破音的干扰并有效阻止意外噪声；
·无变压器电路；
·直接声音处理，低自身噪音：7db-a，整个录音话筒内部结构是弹性的，以减少任何可能会影响tlm103操作的结构噪声，传感器也安装在弹性装置上；
·对结构噪音和风声的干扰很敏感，配有弹性悬挂架ea103和防风罩，在近距离内使用录音话筒时建议加上防爆破音屏。
技术指标
·声音操作原理：压力梯度传感器
·指向性：心型
·频响：20hz-20khz
·灵敏度（1khz-1kΩ）：21mv/pa
·输出阻抗：50Ω
·负载阻抗：1000Ω
·灵敏度（ccir 468-3）：17.5db
·灵敏度（din/iec 651）：7db-a
·s/n比（ccir 468-3）：76.5db
·s/n比（din/iec 651）：87db
·最大声压（thd 小于0.5%）：138db
·最大输出电压：13dbu
·传感器动态范围（din/iec 651）：131db
·电压：48+4v
·电流：3ma
·录音话筒接头：xlr3f
·重量：约500克
·直径：60毫米
·长度：132毫米
The RSM 191 is a stereo microphone system consisting of the microphone and the MTX 191 A matrix amplifier. It has an adjustable pick-up angle and high directivity. The microphone has two separate capsule systems, a hypercardioid element and a figure-8, both in a short shotgun. Together they generate the mid and the side signals.
The matrix amplifier controls the width of the stereo image by changing the gain of the side signal relative to the middle signal in six 3 dB steps. The output signals of the matrix amplifier are either mid-side (MS) or left/right (XY). The signals are converted through transformerless sum-and-difference circuitry.
The balanced, transformerless technology permits the use of long cables between the microphone, the matrix amplifier and the following mic input of other signal processing equipment.
Applications
The RSM 191 system is an ideal microphone system for:
Outdoor stereophonic news coverage, even in extremely noisy surroundings;
Stereo recordings for film and television where the actors are recorded simultaneously with acoustic ambiance, or an orchestra;
Stereophonic motion picture sound where the width of the sound image must match the camera viewing angle.
Construction
The RSM 191 consists of a capsule head containing two separate transducer systems and an amplifier section with two independent transformerless microphone amplifiers.
An interference tube system with a hypercardioid characteristic generates the middle signal, while a horizontal figure-8 assembly provides the side signal.
Acoustic features
The RSM 191 achieves its high directivity and special acoustic features through a unique construction. The microphone capsule assembly is mounted inside a housing tube that is acoustically open but has a high flow resistance.
This results in a high driving force for the diaphragm, even with a low pressure gradient factor of the capsule. Therefore, the microphone can suppress unwanted off-axis interference to a considerably higher degree than other microphones without such an interference tube.
The middle system (M-signal) combines high attenuation of lateral sound incidence, similar to a hypercardioid characteristic (which is about 10 dB), with the large front-to back ratio of the super-cardioid characteristic.
Therefore, sound from the rear is likewise attenuated by approximately 10 dB. This design approach makes the microphone less sensitive to wind or pop noise than other shotgun microphones.
The side system (S-signal) consists of two single capsules arranged back to back, closely behind the interference tube (M-signal) capsule. Arrows engraved on the microphone housing show their orientation.
The uniform and balanced performance characteristic of the microphone system is achieved without resorting to corrective resonance effects. Therefore, the microphone maintains an excellent impulse response, reproducing all transient phenomena in music and speech without coloration. The entire internal construction is decoupled from the housing to avoid structure borne and handling noise.
Electrical features
The output signals of the included matrix amplifier are in either MS or XY format. The small capsules are mounted in close proximity to ensure transparent and coloration-free stereo sound with excellent mono-compatibility. The stereo acceptance angle is variable and controlled remotely.
Filter and attenuation
For the handling of very high sound pressure levels, a 10 dB attenuation can be switched ON to avoid overloading of the following equipment. To suppress structure borne noise, a high-pass filter in the matrix box provides cutoff frequencies of 40 Hz, 80 Hz, and 200 Hz.
Battery supply
The RSM 191 system is fed from either 2 x P 48 phantom power or from a 9 V battery inside the matrix box. One alkaline battery provides 8 hours of operation.
Delivery range
The complete miocrophone system comes in a robust aluminum carrying case.
Along with the microphone and the matrix amplifier the case contains a windscreen, the special interconnecting cable and an adapter cable that splits the 5-pin XLR output of the matrix amplifier into two 3-pin XLR connectors for channels I and II to connect with the following equipment
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