CMC 640

Primary use:

Polar patterns:

Common name: Schoeps CMC 640

Production Status: Discontinued / Vintage

The CMC 640 is a small diaphragm cardioid condenser microphone, specially designed for the pickup of close speech (under 50 cm). It is similar to the CMC 64 S, but with an additional high-frequency emphasis. This capsule type has the same features as the MK 4 S, but in addition emphasises the frequency response in the 9 kHz region by 4 dB. This effects a further improvement of speech intelligibility, particularly in very reverberant venues such as churches. The MK 40 is used primarily for sound reinforcement of speech. It is not particularly recommended for music recording. The microphone amplifier CMC 6 U and the capsule MK 40 form part of a modular microphone which permits the insertion of RC tubes or KC cables as well as other electronically active accessories between capsule and amplifier allowing for miniaturisation. The CMC 6U Amplifier offers a symmetrical, transformer-less, direct-coupled Class A output stage with low impedance, distortion, and interference. It is designed for standard 48 and 12 V phantom powering. Its circuitry recognises the supply voltage and adjusts itself automatically. Includes wooden box, SG 20 stand mount clamp and B 5 D windscreen. Also available as the compact condenser microphone CCM 40.

Electrical Characteristics

Frequency Response
80Hz - 20 kHz
Output Sensitivity
18 mV/Pa
Max SPL
129
Max SPL, THD:
0.5
Self Noise (CCIR)
22 dB
Self Noise (DIN/IEC)
13 dB-A
Output Impedance
42Ω
Recommended Load
1kΩ
Powering
Phantom 12-48
Supply Current
4 mA
Alternative Powering

Switchable Options

Pad
Filter/EQ
20 Hz, 12 dB/oct.

Physical Characteristics

Connector
XLR-3M
Connector notes
Available Colours
Matte Grey. Nickel.
Weight
85 g
Length
137 mm
Min diameter width
Max diameter
20 mm
Depth

Accessories

Included
Wooden box. SG 20 stand clamp. B 5 D windscreen.
Optional
RC set Singer. RC set Violin. RC. R 2 C KC. B 1 D foam pop screen. B 5 D foam pop screen. W 5 wind screen. BBG windshield. W 20 windscreen basket. W 20 R1 windscreen basket with fur. B 20 speech guard. KC active insertion cable. Cut 60 low-cut filter. Pad 10/20 C attenuator. GVC capsule swivel.