Hooking up Janis subwoofer

I am trying a Janis W1 subwoofer(larger one with a 15" driver)to be hooked up to my system. I am running monoblock amps and my preamp balanced. The X1 amp for the Janis sub has only RCA connectors, can you obtain balanced to RCA plugs, will that work, does anyone know if Janis can install balanced connectors on the X1? Or do I have to go back to RCA's? Has anyone tried this sub with planars? Thanks for your input.