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PZM-11 crosstalk


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#1 Zheng

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Posted 07 January 2009 - 07:11 PM

I used a PZM-11 in different rooms to record interviews, a RDL STM-2 preamp was used to phantom powered the mic and convert the mic signal to line level, all the RDL STM-2 was powered by a single 24VDC PW, in this configuration I was getting serious cross talk problems, I then used a separate 24VDC adapter for each  mic and the cross talk problem went away, I'm scratching my head as to why the PW would make a difference, I'll be greatly appreciated if someone can explain this to me.

#2 MChapman

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Posted 19 January 2009 - 02:55 PM

I do not know for sure, but my best guess is something to do with how the RDL STM-2 handles the ground plane internally. What exactly is the "PW" power supply anyway? I can't find it on the RDL site, so I don't know what it is. Where you using the balanced signal output, or where you having to "un-balance" it? That could make a difference as well.
<span style='color:blue'>J. Mark Chapman
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#3 Zheng

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Posted 23 January 2009 - 04:10 PM

QUOTE(MChapman @ Jan 19 2009, 11:55 AM) View Post
I do not know for sure, but my best guess is something to do with how the RDL STM-2 handles the ground plane internally. What exactly is the "PW" power supply anyway? I can't find it on the RDL site, so I don't know what it is. Where you using the balanced signal output, or where you having to "un-balance" it? That could make a difference as well.


Thanks for your help, PW is just a 24VDC power supply not a particular RDL product and I'm using the balanced signal output, funny thing is that I had phantom-powered several Crown PZM 180 microphones (using a RDL STM-1) before and didn't have any cross-talk problem, by the way any suggestion of mic preamp other than RDL ?

Cheers!