KM184 RF Interferience at DVinfo.net

Dan Lukehart · August 21st, 2009, 01:21 AM

I am getting RF interferience on my KM184. I purchased it used and I get quite a bit of RF interferience from it. Once for a few seconds every 5-10 min or so. It makes it unuseable because I loose takes and shots that cant be done again. I need my cabled mics to never have this problem. I read somewhere on another forum that the older KM184's had this problem but offered no solution.

Is there something I can do to fix this? Get it repaired? Ive never had this problem with a cabled mic before.

Dan Lukehart · August 21st, 2009, 01:25 AM

maybe this?

Shure - A15RF In-Line RF Interference Attenuator

the sound i am getting is similar to when your cell phone is about to go off next to your clock radio. its a soft beeping type sound. I have assumed this is RF though I dont know much about it.

Dan Lukehart · August 21st, 2009, 02:08 AM

I found an example and uploaded a 18 second clip:

YouTube - Audio Problem KM184

John Willett · August 21st, 2009, 03:39 AM

Explain the problem to Sennheiser / Neumann USA, it may need looking at.

Check your cables - many RF problems can be cables or mixer.

Change the cable XLRs to the Neutrik EMC XLRs (this is what I am doing now to all my cables). The EMC XLR has a ferrite bead on pin-1, a ring capacitor that connects pin-1 to the shell and a toothed ring round the female for good connection.

The Canford Audio XLR In-Line RF Filter is excellent and I always carry a few with me. Used at the miser end (rather than at the mic. end like the Shure one).

Also - consider changing the mic. cable to star-quad (I use this type for all my mic. cables).

I hope this helps.

August 21st, 2009, 01:21 AM	#1
Dan Lukehart Regular Crew Join Date: Jul 2009 Location: Yorba Linda, CA Posts: 35	KM184 RF Interferience I am getting RF interferience on my KM184. I purchased it used and I get quite a bit of RF interferience from it. Once for a few seconds every 5-10 min or so. It makes it unuseable because I loose takes and shots that cant be done again. I need my cabled mics to never have this problem. I read somewhere on another forum that the older KM184's had this problem but offered no solution. Is there something I can do to fix this? Get it repaired? Ive never had this problem with a cabled mic before.

August 21st, 2009, 03:39 AM	#4
John Willett Major Player Join Date: Oct 2008 Location: Oxfordshire, UK Posts: 976	Explain the problem to Sennheiser / Neumann USA, it may need looking at. Check your cables - many RF problems can be cables or mixer. Change the cable XLRs to the Neutrik EMC XLRs (this is what I am doing now to all my cables). The EMC XLR has a ferrite bead on pin-1, a ring capacitor that connects pin-1 to the shell and a toothed ring round the female for good connection. The Canford Audio XLR In-Line RF Filter is excellent and I always carry a few with me. Used at the miser end (rather than at the mic. end like the Shure one). Also - consider changing the mic. cable to star-quad (I use this type for all my mic. cables). I hope this helps. __________________ John Willett - Sound-Link ProAudio and Circle Sound Services President: Fédération Internationale des Chasseurs de Sons

August 21st, 2009, 01:25 AM	#2
Dan Lukehart Regular Crew Join Date: Jul 2009 Location: Yorba Linda, CA Posts: 35	maybe this? Shure - A15RF In-Line RF Interference Attenuator the sound i am getting is similar to when your cell phone is about to go off next to your clock radio. its a soft beeping type sound. I have assumed this is RF though I dont know much about it.

August 21st, 2009, 02:08 AM	#3
Dan Lukehart Regular Crew Join Date: Jul 2009 Location: Yorba Linda, CA Posts: 35	I found an example and uploaded a 18 second clip: YouTube - Audio Problem KM184