Joel C Hernandez Posted February 22, 2016 Report Share Posted February 22, 2016 I recently purchased a Schoeps CMIT5U microphone. I've used it 3 different days and I'm noticing that when powering on the channel (of my SD 633) that the CMIT5U is plugged into, the mic makes a buffer/glitch noise that I hear. Sometimes it's more of a click sound, it varies. The mic seems to perform fine beyond this anomaly. Just wondering if this is common for this particular mic? I've had no problems with my CMC641 / MKH416 / MC930. Thanks- Quote Link to comment Share on other sites More sharing options...
ao Posted February 22, 2016 Report Share Posted February 22, 2016 the schoeps is somewhat power hungry. perhaps the phantom power supplied by the 633 is a bit low for it Quote Link to comment Share on other sites More sharing options...
RadoStefanov Posted February 22, 2016 Report Share Posted February 22, 2016 The cmit makes a strange noise when first supplied with phantom power. At least on Zaxcom recorders. Quote Link to comment Share on other sites More sharing options...
KGraham045 Posted February 22, 2016 Report Share Posted February 22, 2016 I'm a Zaxcom user, both my CMIT5U do the same thing it's normal. It does differs sometimes Quote Link to comment Share on other sites More sharing options...
Jack Norflus Posted February 22, 2016 Report Share Posted February 22, 2016 I spoke to Scott at Redding Audio when I first got my CMIT several years back. And I dont remember the whole technical reason - but it has something to do with the way the microphone powers up. Earlier mics didn't do this but for some technical reason Schoeps started doing this with the CMIT. It's perfectly normal and there is no issue with the mic. Quote Link to comment Share on other sites More sharing options...
Joel C Hernandez Posted February 22, 2016 Author Report Share Posted February 22, 2016 Thanks for the feedback, gents. Good information to know. Quote Link to comment Share on other sites More sharing options...
RadoStefanov Posted February 22, 2016 Report Share Posted February 22, 2016 just keep the gain down or IFB off Quote Link to comment Share on other sites More sharing options...
John Blankenship Posted February 22, 2016 Report Share Posted February 22, 2016 It's good operating practice to have the gain down when powering on any upstream gear. Quote Link to comment Share on other sites More sharing options...
Jack Norflus Posted February 22, 2016 Report Share Posted February 22, 2016 This is from Scott at Redding: CMIT 5U + SuperCMIT 2U Tech Note RE: Note on Powering and Startup Noise We changed the design of the CMIT 5U for the sake of higher operation reliability. Up until the last production run, the CMIT 5U had a mute function that switched off the sound when the powering was too weak. This also suppressed the booting procedure of the CMIT 5U when it is plugged in. Unfortunately our ambition for perfectness turned out to be a disadvantage. Sometimes the CMIT 5U is used with a weak supply, some battery converter or wireless transmitter. With the batteries losing their charge these customers became the victim of that trap - suddenly the CMIT 5U turned off as it detects the too weak supply. As of 8/2011 we disabled that mute function from the current series on and now in allCMIT service cases. For the acceptable "disadvantage" of the short starting noise the microphone now works withnearlyevery power supply. With a weak supply it may lose part of its perfect parameters like output swing capability but it will continue working. Overall we see this as a big advantage for the customers. Just ignore that starting noise. It is very short and will not be heard if one connects microphones with the volume muted at the mixer. Every microphone makes some noise during start, it may crackle or it may bubble. No worries. The SuperCMIT2U produces a similar boot noise, which may even last up to 12 seconds. Quote Link to comment Share on other sites More sharing options...
JonG Posted February 25, 2016 Report Share Posted February 25, 2016 Good to know. I have often wondered about this, and have asked my boom ops if they had experienced this before with cmits of other mixers. They said no, but I am guessing that those mixers had older mics. Quote Link to comment Share on other sites More sharing options...
soundtrane Posted February 26, 2016 Report Share Posted February 26, 2016 <The SuperCMIT2U produces a similar boot noise, which may even last up to 12 seconds.> Yes it does, strange digital hash noise... Quote Link to comment Share on other sites More sharing options...
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