Is it save to convert XLR to RCA?

The 4V refers to the DIFFERENCE between the non-inverted and inverted signals that are provided to pins 2 and 3, respectively, of the XLR connector. Each of those signals individually has a maximum amplitude of 2V. By adapting the XLR output to an RCA input, you would only be using one of those signals (the non-inverted one), so the RCA input would see a maximum amplitude of 2V.

Something to keep in mind, however: Most XLR-to-RCA adapters, and perhaps some adapter cables, short the inverted signal on XLR pin 3 to ground (XLR pin 1). Many components won't have a problem with that, but some will (if it is done on an XLR output; it is no problem on an XLR input). Use an adapter or adapter cable that leaves pin 3 unconnected. Talk to the supplier to be sure that is what they will provide.

Another approach to consider would be to just use the RCA output, via a y-adapter that would allow you to connect it to two destinations. That should work fine as long as the total of the two cable lengths is not extremely long.

Regards,
-- Al

Thanks so much for the response, folks!!

I am fully aware I'm losing the XLR benefits by using a convertor. I just want a second output.

+1 to all the above. I use Cardas XLR > RCA adapters to connect preamp to subwoofers. Cardas disconnected pin 3 for me at no extra charge.

Assuming you get the correct adaptor, while you will have no benefit going from balanced to RCA, it shouldn't be worse than RCA-RCA.

Also, if you go with an RCA splitter, I would go with a one-piece metal splitter, rather than a Y-cable.

Al, i am considering using an RCA-XLR adapter to convert the RCA output on a preamp to XLR such that i can use am XLR-XLR IC to an XLR input on my power amp (power amp can take either, but i only have XLR IC's presently). this is temporary until i purchase a pair of RCA IC's.

regarding connecting pins - the advice in this thread is to leave the pins open. there was an interesting conversation between you and Ralph (atma-sphere) where i thought the recommendation was to connect the pins here:

http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1280795210&openfrom&1&4#1

"...To correct this, open up the XLR side of the adapter and have someone (if you can't solder) connect pin 1 of the XLR (ground) to the unused connection (often pin 3, which is the inverted input).

This will get rid of the hum and the amp will have normal gain..."

is the solution different for converting RCA to XLR vs converting XLR to RCA? just trying to figure out the best way to use an XLR IC with an RCA preamp output.