RCA to XLR connection

Another option:
When I owned an Audio Research LS-5 MKIII (only built with balanced inputs/outputs), this unit came supplied with XLR/rca adaptors that had excellent build quality. I believe Audio Research still sells them. Good luck.

Another source (have not bought from them though)http://www.markertek.com/MTStore/product.CFM?BaseItem=HK-110M

Follow up to above. Just got my XLR to RCAs today. Very nice quality metal jacket connnectors. So it is a recommendation.