Connecting to Klipsch active speakers and using external flash drive with flac library.

Hi' at the moment my system is Klipsch acive speaker with a DAP source playing my Flac Hires files via optical and I've been told it would be best to use a desktop streamer.

Interested in the node I would need to understand the following

Does the node accept a libary content via it's usb port.

what's the best way to connect to my powered speakers would it be optical hdmi or rca.

thankful for any advice on these maters

Mark