Are you using the WASAPI or ASIO pluggin? Make sure you're outputting through the correct device, check your Preference\Output\Device. For example - Preference\Output\Device\WASAPI (EVENT) : Schiit JotunheimI recently received k3. It is amazing dac. But have one problem with it. Has anyone have tried K3 in windows 10 pc. Don't know why LED color doesn't change when i am changing from 48 to 192 khz or higher. Using foobar 2000. It changes only when i manually set in windows speaker properties - default format (for example 48, 192, or other). Only then led color changes. Does it mean that k3 doesn't recognize input that is coming in from pc? For example i have tried to play from my android mobile using as a usb dac- everything is fine. LED color changes according the input it receives. Why then it doesn't changes automatically in windows 10 pc. So if somebody has this new k3 and tried in windows pc configuration, can share their experience? Other than this little problem i am more than happy with my k3. It is really amazing dac/amplifier.
Good luck!