After 10 hours in on my 1Z listening with Z5's on balanced high gain, having tried all firmwares, I have to say I am deeply impressed with it. Coming from my Z1060 which I used since 2012 it must have left an imprint in my brain. Using the 1Z on FW 2.0 making use of the phase linearizer on Standard B and no EQ, it is like a much improved Z1060 to me. Much more detail, 3d like positioning of instruments and higher quality bass though a bit less in quantity. With the phase linearizer on it provides me with the analog type of sound I enjoyed from my previous DAP and also provides a bit more bass. As both my Z5 and 1Z are new I believe I can expect changes in sound with burn in? What will happen in the bass department over time?