Looking for assistance with JL Audio sub and KCT

I have a JL Phantom f112 and I'm looking for the best way to connect it to a Krell KCT Preamp. The power amp is a Krell Evolution 302. My speakers are B & W 805S. I currently have the JL connected to a Manley Jumbo Shrimp the Manley has two single end Main Outs so I have one out going to the sub the other going to the speakers and everything works. I would like to switch over to the KCT for a while for a little listening comparison but the KCT has only one single ended L & R out and one XLR balanced L & R out. Will I damage the sub or the preamp if I connect the sub to the XLR outs and the speakers to the single end outs at the same time?