Here are some first comparison impressions between the Ztella and the DC01, using my **** earphones. This is using MQA tracks, with some random tracks from the Tidal MQA party playlist. Keep in mind that this means the DC01 is unable to unfold the tracks to higher playback frequencies and the Ztella will also prepare the audio for better digital to analog conversion.
The most apparent difference is that the soundstage of the Ztella is holophonic sounding, like a circle, while that of the DC01 is like a straight line from left to right.
The Ztella has stronger/deeper sub-bass, while the DC01 seems to have a bit stronger regular bass. Both have good attack.
Treble on the DC01 is a bit more bright and harsh, vocals are more forward, which might also be because of its shallow soundstage (it is wide though).
The Ztella has a bit better instrument separation and a fuller, sweeter sounding spectrum. Detail is better on the Ztella.Though interestingly a trumpet sound on Coming out by Diana Ross was more full/warm and textured sounding.
Comparing the two was a bit of a hassle, as UAPP can't handle swapping DACs and has to be restarted every time. I used a FiiO adapter to connect the balanced earphone cable to the single-ended connector of the Ztella.
Both DAC/Amp cables have good audio quality. I think what makes the Ztella so addictive to listen to is its 3D sounding soundstage, coupled with the smooth treble and strong sub-bass.
I can recommend the Ztella, the combination of a very small for factor, not high power consumption, audio quality and features is really good.
As for the DC01, it can have some background hiss with certain ear/headphones and is a bit larger, still really good, a lot cheaper and with a balanced output.