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RCA to XLR adaptor causing amp to shut down

Can anyone help guide me please: Using RCA to XLR adaptor causes amp to shut down going into protection mode. The application is Luxman 595ASE pre out RCA to XLR on Avantgarde Duo Mezzo XD active base units.
When using Mark Levinson pre RCA out this works fine.

Opening up the adaptor, pins 1, 3 and what I assume is an earth tag are linked with pin 2 connected at the RCA end. I tried cutting the connection between pins 1 & 3 and this stopped the shut down but introduced a significant hum.

chrispb1
mikem
260 posts
 

Cardas makes an XLR to rca adapter that floats pin 3.  All the other adapters I have used tie 1 & 3 together which can short out some electronics. 

erik_squires
16,056 posts
 

The more expensive way to do this is to use an isolation transformer. 

gdnrbob
4,444 posts
 

If your amp is not using the XLR pins in the proper configuration, I can see how this might happen.- That the Levinson works would seem to confirm this.

B

fuzztone's avatar
fuzztone
5,598 posts
 

Just swap the hot/return between 2 & 3.

There is no absolute standard. I had to rewire my Shure mic transformers back in the day.

lalitk's avatar
lalitk
5,447 posts
 

Another vote for Cardas XLR-RCA adapters, they worked flawlessly for me. 

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