DSD over USB

Normally you need a SACD player for DSD.

Your PC won't play it without converting it to PCM first.

A couple of guys formulated an open standard (DoP) allowing direct DSD playback on a PC to a USB DAC.

Not only must your hardware (DAC) support it but your media player as well.

When I wrote this in 2012, DAC's supporting DSD where rare.
Today DSD support is common as manufacturers of USB receiver simply supports it.

DSD - The welltempered computer

DoP - The welltempered computer