Hi,
Go to your Playback and show screen shots of your Output (ASIO, WASAPI, other?), etc. Do the same under tools, for your SACD or other appropriate one there and its settings (screen shots).
Also, how did you make or get your FLAC files?
Similar threads doing nearly the same thing, maybe useful:
I have many SACD ISO files. I use Foobar to convert them to FLAC files and then stream the high-res FLAC files to my OPPO BDP-105 from an ethernet network drive. Problem is, Foobar only creates stereo FLAC files from my SACD ISOs (even if the SACD has a multichannel layer). I know my OPPO...
www.avsforum.com
Very best,