Schoeps CCM 4A 话筒麦克风批发零售 Schoeps话筒 Schoeps麦克风 德国Sc

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Schoeps话筒 德国Schoeps话筒麦克风 CCM 4A 话筒  Schoeps麦克风 CCM4A

MK 4A，CCM 4A

近距离语言或音乐拾取

（小于250px）

心形模式

灵敏度降低

较大的低频衰减

在某些环境使用心形话筒时，如歌唱家或主持人使用的手持式话筒，近讲效应会变得非常明显。此外，其输出电平要比其它话筒高的多，这样会加大 拾 音 距 离 或 改 换 动 态 类型 。 这 两 种 特 性 都 不 是 我们想要的。因此 SCHOEPS提供了特殊版本的 M K 4 S/ CCM4S，即 MK4A 或C C M 4 A (“A” 意 为“ 衰减”)，它在低频上有更强的滚降，并降低10dB的灵敏度。

这种话筒类型主要用于很近距离和高声压级拾音环境。

距离较远时，它只能提供低输 出 电 平 ， 导 致 信 噪 比 降低.

所有CCM话筒类型的技术指标：

供电： 12V ± 1V 或 48V ± 4V 幻像供电

电流损耗（自动切换）： P12：8mA，P48：4mA

源阻抗： 90 Ω

推荐最小负载阻抗： 600 Ω

低切频率（－3dB）： 20Hz

U版本长度： 46mm－58mm，根据型号决定

L版本长度： 46mm－58mm不带连接器

直径： 20mm

不包括线缆的重量： U版本：33g，L版本：43g

表面抛光： 磨砂灰（g）或镍（ni）

线缆（K 5 LU）标准长度： 5m

如果需要其它长度可单独定制，但便携盒所能容纳的线缆最大长度为10m。

Schoeps CCM 4A LG Overview

The Schoeps CCM 4A LG Compact Cardoid Microphone for Close Pickup offers a strong low-frequency roll-off and 10 dB low sensitivity. This microphone is recommended for use exclusively in situations of very close pickup and high sound pressure levels. At greater distances, it would only deliver a low output level, resulting in an effective reduction in signal-to-noise ratio.

This compact microphone consists of 2 main components, an acoustic transducer (a capsule) and a microphone amplifier, which come together in the same body. The capsule is the component which converts sound waves into a varying electrical voltage. It determines the directionality and, for the most part, the sound quality of the microphone. The amplifier is the other main component, with the circuitry required to accept external powering, polarizes (charges) the capacitive capsule, obtains the audio signal from it, and converts that signal into one which is balanced and low-impedance. The circuitry of the microphone features a balanced, class-A output stage which does not use either coupling condensers or an output transber. This leads to low output impedance, insensitivity to electrical interference, low distortion, and light weight.

This microphone has a bass roll-off filter with a low cut-off frequency of 20 Hz and a slope of 12 dB/oct. This frequency has been chosen to protect against perturbing, inaudible (infra-) sound that can be caused by ventilation systems, track vehicles, and wind. Although it is hardly noticeable, infrasound can cause strong audible distortions in the connected equipment when it leads to an overload. This would make it impossible to produce a recording that could be used. The audio range also only starts at around 20 Hz. Lower frequencies are only actually discernible at high levels which are only reproducible on few audio systems, and then quickly become unpleasant.

The CCM 4 A LG microphone is an electrically active component requiring operating current. It uses a standardized powering scheme known as phantom powering. Most recording equipment offers a 48V supply for such microphones. Some equipment, however, provides a 12V supply for phantom powering, or can readily be modified for such a supply. The CCM compact microphone can work with either voltage, switching its circuitry automatically to the corresponding mode of operation. It maintains the same level of perbance in either mode while drawing only the necessary amount of current from the phantom supply.

Cardioid pattern

For pickup of speech or music at close range (under 3.9" (250px))

Reduced sensitivity

Considerable attenuation of low frequencies

True condensers that do not require electronic frequency response correction

Balanced, low-impedance output via removable 16.4' (5m) cable with Lemo to XLR-3M connectors

For universal use

Small and light

The Lemo disconnect allows for use of special accessories, some similar to active components of the Colette Series

Flat frequency response

Sound is extensively independent of directional pattern

Low noise and distortion

Runs on both 48 and 12V phantom powering

Can be used with very long cables (over 328' (100m))

Matte gray non-reflective surface finish

Schoeps CCM 4A LG Specs

Current Consumption With 12 V: 8 mA

With 48 V: 4 mA

Impedance 90 Ω

Load Impedance Minimum recommended: 600 Ω

Frequency Low-cut: 20 Hz

Frequency Range 80 Hz to 20 kHz

Sensitivity 13 mV/Pa

Equivalent Noise Level A-weighted: 14 dB-A

CCIR: 24 dB

Signal-to-Noise Ratio A-weighted: 80 dB-A

Maximum SPL 132 dB-SPL

Surface Finish Matte gray

Length Without Connector: 1.8 to 2.2" (46.0 to 58.0 mm)

Diameter 0.7" (20.0 mm)

Weight 1.5 oz (43.0 g)