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Interesting that you have that kind of synergy using usb to spdif coax on your system. Actually, I use to have my W4S uLink fed to the original Bifrost MB that I have since the USB implementation didn't reproduce microdetails such as the overtones of common instruments as well as coax and it also gets congested in the bass region. Now with Bifrost 2, I find that the synergy with my W4S USB to coax solution sounded a tinny bit analytical/slightly edgier on the overtones nevertheless far less straining than hyperclean/hypermeasuring DS DACs. With Unison, it retained the same overtones and microdetails that I crave with the coax input but this time the sound is a tiny bit more relaxed in presentation. The bass region and staging + layering between Unison and Coax are indistinguishable to me though, but the hi-hats and other mid to mid-high frequency overtones with Unison sounded a bit more relaxed to me yet retaining that delicate overtones with "lifelike" presentation while hyper-measuring DS DACs reproduce the overtones (omitting some as well) without sounding "lifelike".