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Gear / Technical Help => Microphones & Setup => Topic started by: ricola on October 26, 2015, 12:22:06 PM

Title: still heavy cellphone noises on recording
Post by: ricola on October 26, 2015, 12:22:06 PM

Hey folks,
I use neutrik emc connectors on both ends of the cable, at the mic and at preamp/recorder for the usual 3 pin condenser mics - no cellphone noises anymore, here I could fix the problem.

However....when I use my 5 pin Stereo mic (splitted with a 3 pin xlr cable for right and left channel into the recorder, I still have this terrible cellphone noises on the quieter parts of the show!
I also tried to combine the splitted 3pin xlr ends with the Neutrik NC3 MXX-EMC connectors...without any success.
I'm afraid there is no way to solve that problem with a usual Stereo mic and 5 pin output??

Any help or suggestions would be appreciated!!

Thanks

Title: Re: still heavy cellphone noises on recording
Post by: Sonus Captor on January 17, 2016, 05:30:48 AM

Hi Ricola,

I once asked a Neutrik rep about the EMC connectors and he said that they work most effectively if you earth your recorder/preamp.

Title: Re: still heavy cellphone noises on recording
Post by: DSatz on January 18, 2016, 12:20:27 AM

The interference is very likely being picked up and detected (i.e. converted to audio frequency pulses) within the microphone itself. If so, the noise would already be part of the signals coming out of the microphone, and EMC connectors can't help.

That situation, if true, wouldn't be at all unusual, I'm sorry to say. Few microphones are specifically designed to withstand cell phone interference, even among the top-rank manufacturers (a paper about this problem was given at the AES Convention in 2003). Semi-pro and consumer equipment, where the design is heavily determined by cost considerations, are even worse off.

http://www.pin1problem.com/

--best regards

Title: Re: still heavy cellphone noises on recording
Post by: 404 Not Found on January 22, 2016, 10:46:20 AM

You can always run an inline RF filter as well.

Sescom sells these new around $25 - 30 each.  Not a bad investment.

Title: Re: still heavy cellphone noises on recording
Post by: DSatz on January 25, 2016, 09:22:55 PM

Actually, the Sescom "filters" (SES-INLINE-EMCF and SES-INLINE-EMCM) are simply XLR barrel adapters with one side of each model (depending on -EMCF or -EMCM) being a Neutrik EMC connector.

I asked Sescom's engineers what they had in mind with this odd design choice (e.g. who would use one vs. the other vs. the two in tandem?), and they couldn't give me a straight answer. Nor can I imagine one.

If you want an actual RF filter (i.e. a series low-pass filter), you can get those from Shure (A15RF) and probably other manufacturers. However, such things are effective only if the microphone is putting out a clean signal with no noise resulting from interference.

--best regards

Title: Re: still heavy cellphone noises on recording
Post by: John Willett on January 26, 2016, 07:27:03 AM

I would check the XLR-5F at the microphone.

Is pin-1 connected to the shell?  -  if not, I would link pin-1 to shell in the XLR-5F so you have a good screen connection to the mic. body.

Title: Re: still heavy cellphone noises on recording
Post by: DigiGal on January 26, 2016, 11:53:10 AM

Quote from: John Willett on January 26, 2016, 07:27:03 AM

I would check the XLR-5F at the microphone.

Is pin-1 connected to the shell?  -  if not, I would link pin-1 to shell in the XLR-5F so you have a good screen connection to the mic. body.

^ This

OP - what specific stereo mic are you using?