I'm primarily using D2 to drive the LCD2 headphones. My LCD2 is pretty much brand new, only had a couple hours on it.
Quick impression on D2 so far:
- The sound is very smooth with none of those digital artifacts. Though a certain female vocal could sound smoother still.
- I couldn't tell much of a sonic difference using Toslink (Logitech Duet via Lifatec glass Toslink cable into D2) vs USB playback using Foobar2000. I used some redbook classical tracks and the Chesky "The Worlds Greatest Audiophile" 24/96 high-res tracks.
- The transients and attacks are a bit slower than my full blown 2-ch stereo system. The reverbs and decays are also a little less. The former could be the characteristic of LCD2 or the limitation of the D2's heaphone amp. The latter could improve once the unit has more break-in hours. In my experience the Cree SiC would need 72-hr to reach 90% break-in.
- Bass is not nearly as punchy or tight as my full blown 2-ch. But things could improve once the break-in is complete.
My 2-ch system consists of amps that have no negative feedbacks and high current drive (>50amps peak). I run a bi-amp system with DSP active crossover, so there is no passive crossover b/w bass drivers and mid-range drivers/tweeters. This achieves very high level of transparency. It is a full digital setup with no DAC from the source to the amps.
So naturally, if D2 loses to my full blown 2-ch, I'm not surprised