mghough

DPA RFI Problem

8 posts in this topic

I purchased the DPA4017b set from B&H about 7 months ago.  I love the mic but after 4-5 months I started having serious RFI problems with my TX742. (See Video) Does anyone know how to solve this?  I've spoke to DPA and they say that I need to send in the preamp so they can evaluate it.  I'm living in Mainland China so sending anything out of the country or receiving anything from out of the country is a problem.  I previously used a RODE NTG3 for years without a problem.  I really expected more from a mic that cost more than $2000!!!

 

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disconnect the connection in the female XLR between pin 1 and the shell.

done that to my suspensions and have no issues with my 4017B in a cinela mount, or my 4011C in a rycote invision with custom low profile XLR.

if you plug the 742 straight into the mic, and you have RFI, then you need to get hold of another 742 and 4017B so you can swap thing sover to see where the problem is.

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Similar to Rich, I was going to suggest putting an XLR cable with and then without a grounded shell between TRX and O/P stage, at least to see what happens.

I was also curious to know what happens with your 4018 + mmpB + TRX742.

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Maybe the DPA 4017B is the older version. I had problems in the other day with an older version of DPA 4017B; cable to SQN.

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4 hours ago, rich said:

disconnect the connection in the female XLR between pin 1 and the shell.

done that to my suspensions and have no issues with my 4017B in a cinela mount, or my 4011C in a rycote invision with custom low profile XLR.

if you plug the 742 straight into the mic, and you have RFI, then you need to get hold of another 742 and 4017B so you can swap thing sover to see where the problem is.

742 direct into the mic is better.  also using another mount where the cable doesn't encircle the preamp is fine.  I like that mount and that preamp (if working properly) shouldn't have this issue.  I could change mounts but would rather not.  I may try the pin disconnect idea. :)

3 hours ago, daniel said:

Similar to Rich, I was going to suggest putting an XLR cable with and then without a grounded shell between TRX and O/P stage, at least to see what happens.

I was also curious to know what happens with your 4018 + mmpB + TRX742.

4018 with the MMPb has the same noise issue just thought that would be redundant to show in the video.  

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hmm.

will double check my 4017B with the 742 straight into it, but i dont remember any problems. and certainly have had no issues with it in use.

i remember that the MK1 4017 had RFI issues, but the MK2 was supposed to have cured that. but i think that you, the same as me have the modular system, which for me has been noise free.

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I had the same problem and connected pin 1 to the shell on both ends and the problem went away. I was using a Neumann KMR81 though, and I connect up next to the mic to add to Rado's question, if it matters....

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