I agreed, piano is hard-sounding. What your tube DAC has done is limit the HF dynamics. You are getting the sustain and decay, but not the attack. This will make a Steinway sound like a Baldwin. I have experienced this "pretty" sound myself, since I mod so many different DAC's. It isn't real, trust me. To achieve live-sounding piano (which is my reference recording), you need sibilant-free playback with excellent focus and good HF dynamics. My wife plays our Yamaha grand in our music room, so we both know what live piano sounds like.
And just because most stock Sonys can be bettered by more expensive gear means nothing. The key is that the right digital signal processing is being done in there, so with mods, these other deficiencies can be overcome.
And just because most stock Sonys can be bettered by more expensive gear means nothing. The key is that the right digital signal processing is being done in there, so with mods, these other deficiencies can be overcome.