Battery-Powered Microphone Amplifier
Collette modular microphone system amplifier.
Internal 6V Battery / External 7 - 13 VDC, Unbalanced out, includes K 5 ISK Cable.
Available in Matte gray (g) or Nickel (nl) Finish.
Schoeps CMBI Features :
* Unbalanced, medium-impedance output
* For use with short cables (a few meters)
* For connection to any desired microphone input
If a recorder has no phantom powering or a microphone input is unbalanced as in many portable recorders and wireless microphone transmitters, a phantom-powered microphone can be awkward to use. For these and other situations SCHOEPS offers the CMBI, a battery-powered microphone amplifier with unbalanced output.
Combine this with one of 19 microphone capsules of the Colette Series and you obtain a microphone which is acoustically equivalent to the balanced version using a CMC microphone amplifier.
The CMBI features a readily available internal 6 V silver oxide battery which, combined with power-saving circuitry, gives up to 80 hours of operation.
About 6 hours before the end of battery life a built-in LED begins to light up as a warning.
In addition to battery operation, the CMBI allows for external powering through a standard XLR microphone cable. (The included K 5 ISK cable is not suitable for this mode of operation.)
Because of this model's unbalanced, low-level output and its medium output impedance, the total cable length should be kept to less than about 15 m to avoid possible RF interference and impaired performance.
Possible arrangements for connecting the CMBI are shown in the technical appendix.
* Wooden case, battery, adapter cable K 5 ISK (miniature plug to 3.6 mm mini stereo phone plug, 5 m long)
* Microphone capsules, windscreens, etc.
* Neither the Colette Series Active Accessories nor the BLM 03 Cg can be used with the CMBI.
Schoeps CMBI Specifications :
Maximum output voltage:
“0 dB”- position: 700 mV
-15 dB”- position: ca. 140 mV
Maximum sound-pressure level at 0.5% THD (capsule- and load-dependent):
switch position “0 dB”:
RL > 10 kOhm: > 130 dB SPL
RL= 1 kOhm: ca. 120 dB SPL
switch position “-15 dB”:
at least 130 dB SPL
in position “0 dB”: 500 Ohms
in position “-15 dB”: 300 Ohms
Switches: combined on/off/attenuation switch with three positions: on (0 dB)/ off/ on (-15 dB)
internal: 6 V silver oxide battery (e.g. IEC 4 SR 44)
external: 7 - 13 VDC
Output connector: 5-pin miniature
Maximum battery life: 80 h
Diameter: 20 mm
Length without capsule: 92 mm
Weight: 72 g
Surface finish: matte gray (g) or nickel (ni)
Instead of a large XLR connector, the CMBI has a flush-mounted 5-pin miniature connector at the output which also allows for external powering. For normal connection of the CMBI to a DAT recorder, etc., a 5 m cable with a 3.5 mm mini stereo plug is included (Fig. 1).
This cable can be extended with a standard 3.5 mm stereo jack to stereo plug cable, or with a miniature-connector extension cable such as SCHOEPS KS 5 I (Fig. 2, see also miniature stereo recording system).
For operation with pocket transmitters we have ready-made cables with special connectors on request (Fig. 3).
For stereo recordings there is a Y-shaped cable (KIY 250/0 I) which connects two CMBI to a compact junction box by means of two pieces of cable, each 250 mm in length. The short cable leading out of this box has a miniature connector and can be extended either with the K 5 ISK cable (Fig. 4) or with the extension cable KS 5 I.