Hmm
Using Roon via USB with optimum settings (Wasapi, Exclusive Mode and no DSP) the X-Sabre Pro sounds tonally full yet very precise. In some setup combinations (only when playing PCM), some people might find it to be a little dry, but this can easily be ameliorated by switching on the Dither option. This makes for a nicely subtle smoothing effect that creates more fluid decays while providing seemingly higher resolution. I kept it on for the duration of my testing.
When switching off Jitter Reduction the bass seems to become a little bit more articulate which in itself is nice, but the midrange and treble also become a bit too forward and a little edgy this way, and so I would recommend always using the DAC with Jitter Reduction enabled, as I did for the rest of the review.
In USB, asynchronous is the magic word, and there are hardly any DACs that use synchronous USB, usually for good reason. The X-Sabre Pro, however, offers the user the option to choose. Switching from Asynchronous to Synchronous USB mode indeed seems to illustrate nicely why this mode is not used very often anymore. In this context, I found that all the musical aspects lost a little, while nothing was gained. This makes perfect sense but the setting is a nice option to have if only to prove that the X-Sabre Pro’s clock is more accurate, or at least works better in Async mode.
I think effect he attributes to each setting are greatly exaggerated or entirely in his head. Dither creates a 'smoothing effect that creates more fluid decays' ??? Really?