I just found out one thing which may be useful for people who find that the CLAS->Stepdance is too loud for the ES5. I tried using the Fostex HP-P1 and connect its line out to the Stepdance (15V regulated), then through a Twag v2 cable to ES5. The volume is just right for me and I even had to turn up a bit from the lowest volume to match my normal listening level. The sound? Sublime. I therefore suggest the Fostex HP-P1 as a good front end iPhone DAC for those who find their Stepdance too loud (even at low gain and lowest volume) and don't bother to do the -6 dB mod. It is pretty amazing what these bricks can do - but still, I just go iPhone 4S -> ES5 when I am on the go.