bflat
Headphoneus Supremus
I tried briefly the Utopia at the last Canjam in NY with my SP1000 and I have to say I wasn't impressed, I honestly have the feeling that the SP1000 cannot drive the headphone, even if it's loud, it feels it's lacking the correct alumni of resolution and dynamism.
I use my SP1000 with Utopia in balanced output and volume at around 100 is plenty loud. That was good enough when I auditioned the Utopia with my SP1000 to make my decision to buy. Like you said, definitely not at the level of resolution and dynamics compared to my desktop chain but still 90%+ there. But to say that an IEM like Z5 has more details doesn't seem possible if everything is functioning correctly. I had the Z5 and "resolving" is not how I would characterize it. I just think that Utopia can out resolve what the SP1000 can produce.