Wouldn't be a problem. Just connect the RCA shell to Pins 1 and 3 on the XLR, and the RCA Pin to Pin 2 on the XLR. You may want to double or triple check my explanition of the XLR pins, I cannot find one of my manuals that has what I'm looking for. But XLR has three pins 1 = ground, 2 = signal, 3 = return.