balanced to unbalanced connection

I have Channel Island monoblocks which only have XLR connections and a preamp which only has phono outputs. What do people think is the best way to connect them. Do I use a XLR to phono adapter at the amp end. A XLR to phono adapter at the preamp end? Do I use a balan at the preamp end? Or should I just cut end of a phono interconnect and solder on an XLR. At the moment I made up a couple of cables mostly out of stuff I had lying around. The runs are only about 18" but I do worry about emissions from the class D monblocks, the satellite receiver and the TV in the area.