Schoeps CMC6 U

The chief task of a CMC microphone amplifier is to convert the extremely high-impedance signal from the capsule to a very low-impedance one suitable for transmission through a microphone cable.

Several versions are available which differ only in their powering, connectors, output levels and surface finishes. They all feature a symmetrical class-A output stage with neither coupling condensers nor an output transformer. This design helps them to achieve extremely low distortion and light physical weight, while their very low output impedance helps make them insensitive to electrical interference.


Schoeps CMC6 U Features :

    * Balanced, very low-impedance output
    * Can be used with very long cables (several hundred meters)
    * Can be used with Active Accessories for miniaturization and special applications
    * Collette modular microphone system amplifier.
    * 12V-48V Phantom Power and Balanced Output.
    * Matte gray (g) finish.



On the choice of amplifier type:
If a recording device has balanced inputs but lacks phantom powering, it may be possible to add 12 Volt powering rather easily by using a supply voltage that is already present internally. In most cases 48 Volts would need to be generated with a voltage multiplier circuit, which is more difficult to implement. That is why we recommend the CMC 6, which works with both 12 V and 48 V phantom powering so long as the relevant standard is followed.
If it is certain that 48 Volt phantom powering will be available in all foreseeable recording situations, the CMC 5 should be fully satisfactory. In addition to the CMC 6's dual-voltage circuitry versus the CMC 5's single-voltage circuitry, the two amplifiers differ in their response at the very bottom of the audio frequency range. The CMC 5 rolls off below 30 Hz, while with digital recording in mind, the CMC 6 is essentially flat to 20 Hz.
The CMC 3 is designed for 12 Volt phantom powering. If necessary it can also be driven from certain 48 Volt phantom supplies, but it will draw significantly more current than a CMC 5 or CMC 6 without offering any particular advantage for doing so (a CMC 3 draws 11 mA at 48 V).
The CMC 4 works only with 12 Volt parallel powering (“T-feed“), which is rarely encountered nowadays except in video and film sound.

Amplifier Type   Powering      Current consumption   Impedance   Low-cut frequency (-3 dB)

       CMC 6U:   12 V phantom  8 mA                  25 Ohms     20 Hz

Automatically
    switched:    48 V phantom  4 mA                  35 Ohms     20 Hz


Maximum output voltage: 1 V (at 1 kHz and 1 kOhm load resistance)
Minimum recommended load impedance: 600 Ohms (If a lower load impedance is used, the main effect will be to reduce the maximum output level of the microphone.)
Length: 116 mm (incl. 3 mm capsule thread)
Diameter: 20mm
Weight: 65 – 68 g, depending on type
Surface finish: matte gray (g) or nickel (ni)