LG GX950A to Fiio K11

The Fiio K11 has an optical, usb, and coax input. I’m using the monitor for a Mac Mini via HDMI, laptops via USB, and my gaming Pc via DP or HDMI. Any recommendations to power my Fiio and my KEF speakers? I was going to run rca from the Fiio to the speakers. Maybe?

Best recommendations for using something other than the internal monitor speakers?