RCA to XLR connection

Both BAT and Purist Audio Design make high quality adaptors of the kind you need for approximately $90-$110 a pair.Both are excellent.

Don`t buy cheap adapters at the pro sound shops, they broke on me quite a few times. I currently own Purist Audio Design
ones and like them very much. Very high quality and no affect to the sound. They have life time warranty too.

Why not just buy your favorite cables and have the vendors convert them instead of using the converters that, no matter how good they are built, almost always degrade the sound. Most cable makers can do it with a little extra charge. Nonetheless, you must specify the configuration (pin2 negative or ground).

I don't have their web address, but find a company out of Texas called Milestek. They sell a variety of audio/computer related products. They have the excellent Neutrik adaptors in a variety of configurations for $12/each. You do not have to pay alot of money very good adaptors.

Here's the exact webpage of the adaptors the milestek makes, they have all kinds of different configurations Male RCA to Male XLR I think is what you're looking for though.

http://www.milestek.com/interseriesadapt.htm

goodluck