Gear / Technical Help > Microphones & Setup
Schoeps CMR
jerryfreak:
well, i received these yesterday, SN 134&135, always fun to be on the bleeding edge! they're only a few mm's longer than the end of a KC5 active cable.
http://flickr.com/photos/10466474@N04/2311424533/
(BTW, somebody wanted a picture of my 'universal ortf bar', there it is.
I was playing around with them a bit, i would describe them as a typical '3-wire' mic. Basically if you can give them 4-9V on the third wire, pure gold comes out of the other ones. :)
I built a simple (and I mean SIMPLE - one cap, one resistor) powering circuit kindly given to me by bernhard vollmer, and hooked the unbalanced outs from the mics to my V3 (grounding pin 1 and 3 on the V3, of course).
I close mic'd a monitor and recorded at two different volumes:
-monitor playing at a whisper with maximum gain on V3
-monitor playing at typical concert volume, V3 gain at the usual 35 dB
sounded great in both cases, in the louder test, the noise floor of the mic was down in the -70's as expected. The CMRs allow for the full SPL of the capsules (132 dB for an MK4). in the lower volume test, i could hear the self noise of the mic, but i also could clearly hear my voice whispering across the room.
When i get the time, i will be doing a controlled comp vs a CMC6. Schoeps claims the CMR has the same sound and specs (I suppose i could believe that with advances in miniaturization of components in the 30+ years since the CMC6 has been around.), we will see.
The fact that it works at all with my V3 and will still allow me to run a full on open rig with (hopefully) no compromises is a huge breakthrough in my book. Esp since it will make for a killer stealth rig when needed, using the same equipment as people are currently running with the at953s and dpa4061s, except for the bigger mics
this battery circuit literally sips power, 1mA per mic is nothing. i am thinking about switching from a 9V to the tiny 6V silver oxides the CMBI's use.
note that there are two different types of CMR, i got the version with the decoupling capacitor on the signal wire to protect the mics from inputs with 'plug in power', to allow for more preamp options.
i'm working with our favorite north-of-the-border preamp guru to come up with some fun stuff. Trying to get him to expand his talents into the miniature A>D world :)
FWIW, my 'all in one' miniature box of choice, Len's mic2496 didnt really work (yet?). i currently have it setup with voltage on the signal lines for my 2-wire DPA's, and was hoping the presence of the decoupling caps in the mics would eliminate the need for me to reconfigure it. I am gonna try to jumper it to eliminate any mic powering, and then pull power off of the same or a dedicated 9V with the mini-circuit bernhard gave me
stay tuned!
shaggy:
Jamie, do you got a Kwon bar around? Can you see if the collar of the CMR fits the bar?
What is the cabling like? Soft and pliable or rather stiff like the KC5 & KCY?
+T fer sharing!
Nick's Picks:
i'm behind the times.
what is the CMR ?
drewloo:
Microphone Amplifier for Pocket Transmitters
CMR
* specially designed for using SCHOEPS "Colette"-series microphone capsules with pocket transmitters
* low power consumption: only about 1/20 to 1/48 that of a phantom-powered microphone
* low-impedance, unbalanced output
A SCHOEPS Colette-series condenser microphone normally consists of a CMC microphone amplifier plus one of the many available types of SCHOEPS Colette-series microphone capsule, operating from a source of 48 Volt phantom powering.
However, such powering is not available when the microphone is used with a pocket transmitter, as is often the case in film and television production. As a result, SCHOEPS ”Colette” series microphones have been difficult to use for this purpose. Electret microphones have often been the only practical solution.
The SCHOEPS CMR microphone amplifier puts an end to that situation. The CMR allows any SCHOEPS ”Colette” series capsule (except the BLM 03 C active boundary layer capsule) to be used with pocket transmitters. As with electret microphones only a very low supply current is required, yet the CMR offers low output impedance and good immunity to interfererence. The biggest benefit of all, however, is SCHOEPS' well-known sound quality, which this amplifier delivers fully.
The robust connecting cable is reinforced with Kevlar fibers. It remains flexible at low temperatures, and does not twist.
What types of equipment can the CMR be used with?
If the input of the equipment provides 1 mA for a microphone at 4 Volts or higher, the equipment should be suitable.
The current list of compatible devices is available on here.
If in doubt, simply ask your SCHOEPS representative or dealer.
Output cable
In many cases you would only have to tell us the type of equipment and the desired cable length. We could then make up an output cable for you with the proper wiring and plug.
Lead arrangement of the two-conductor shielded cable:
Shield: ground (both signal and powering)
Blue: + pole of the power supply
White: audio output
Nick's Picks:
Interesting.
but what would be the need for this in a "taper" situation ?
seems like it could pose more problems than solutions. and who in their right mind would set up a stereo pair of these and then walk away to record from a different location ?
I could see that in orchestral settings / churches I guess.
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