This is the place for technical discussions about DACs and digital audio in general. This would be the place to talk about UAC1 vs UAC2, or oversampling vs non-oversampling, or what HDCD is and how it works, and other such technology.
This is the place to discuss how the computer or operating system you're using affects what you can play and how. This would be a great place to ask questions about WASAPI, or to discuss which versions of Linux actually support UAC2, and which ones work with the CM6631 chip we use on the XDA-2 and the DC-1.
This is the place to discuss places where you can buy high-resolution digital audio files, why you like (or don't like) particular vendors, and where you can also post reviews about individual files or album reissues.