Hi, I'm using the following properties in my wasapi player on win 8.1 AudioClientProperties audioProps = { 0 }; audioProps.cbSize = sizeof(AudioClientProperties); audioProps.eCategory = AudioCategory_BackgroundCapableMedia; audioProps.Options = AUDCLNT_STREAMOPTIONS_RAW; what does audioProps.Options = AUDCLNT_STREAMOPTIONS_RAW; do ? It seems to be undocumented, the sound quality is better with it set, I don't check to see if my device accepts a raw stream. Regards