So the Lumin X1 came in to me from a friendly dealer who has one and allowed me to spend some time with it.
The X1 is a hefty unit with an outboard power supply, has a built-in volume control and is a full-fledged streamer with Lumin producing its own software. It retails at $14K. Given this unit is a full streamer with volume control, my feeling is that it is more appropriate to compare to the ~$10K DACs rather than the price point above.
I swapped the unit in place of my everyday DAC (the Playback Designs MPD-6) and let it run. The DAC has been used and is burnt in so just a matter of warm-up and letting things get settled.
Opening track of In a Sentimental Mood - piano has good sparkle. Drum rolls lack absolute definition of Weiss or Rockna Edition but detail is very good.
On Be Still My Beating Heart, it is obvious that the X1 is a bit brighter/more forward than the Playback meaning it is probably a touch forward overall. That said (based on notes) it is MUCH less bright than the Lumin T2. The forwardness is present in staging but does not come through in terms of sibilance. The sound stage is big and deep. It extended well beyond the outside of the speakers. Noise floor is very low. When there should not be noise, there is no noise.
Liberty is the same. Forward but not sibilant. effects come from where they should, well beyond the boundaries of the speakers.
Duende is superb. Opening bass notes are clear and undistorted. Dynamics are big. String separation is fabulous on the berg piece. There is nothing not to like.
This unit is extremely competitive in the $10K price range. Compared to the MPD-6, the image is just smaller, has less depth and a hair less detailed. Given the Playback, comparably equipped with on-board streamer is $18K, this should be the case.
What surprised me most is how similar this unit sounds to another DAC I have on hand - the Soulnote. But more on that in the write up of the Soulnote