I run balanced and single-ended out of my BAT VK3i preamp all the time. The BAT provides one set of balanced outs, and one set of single-ended outs. As I use Infinity IRS Beta speaker, I drive the servo woofer EQ box with the single-ended outs, and go direct to my mid/hi amp with the balanced. Excellent! Your preamp may not supply both outputs at the same time, you may want to ask the manufacturer to be sure.