Well, the reason I say that is I believe the HM801 used a 1704 and was either non-oversampling or had some sort of very slow roll-off digital filter. The few FR measurements I could find for it had that sort of NOS droop in the treble. @Mshenay said he preferred the clarity of his other gear, which I'm sure used a more standard OS implementation with more...I dunno, stereotypical sounding DAC chips (i.e. not 1704 sound). The Holo has that sharpness and blackness to it. It sounds detailed and clear but I think covers up some of the nuances and lowest level resolution compared to the better Metrum stuff or Schiit gear on extended listening. But the Metrum stuff isn't the sharpest sounding around even at the top of their product line, but can be quite clear and detailed if you have mega bucks to spend. (Holo in OS mode also isn't great. It's like...why? Just get Schiit for OS.) I know the Schiit stuff can be a little grey sounding, so to speak, but in terms of resolution, details, clarity (above the grey floor), separation, blah blah, sounds like that would be up his alley. You will find compromises in any case, but for his preferences, I think the Gungnir Multibit/Yggdrasil best capture that R2R + Moffat filter magic while sounding most similar to the gear he said he did prefer. Again, a good SPDIF input is key on the Gungnir Multibit at least. Yggdrasil has better USB but still shines with a very good SPDIF/AES source. I could also be totally wrong. @Mshenay, you might love the Holo Spring, Metrum Pavane, and hate the Schiit gear!