iPhone drives them without problem, but the treble is more recessed compared to O2/ODAC driven. Isolation is quite good, better than my aJays IEM. They leak a little when played really loud, otherwise they are quiet on the outside. Quote:

Quote:   Mine arrived as well. I'm very satisfied with the sound. Quite sensitive. I expect that the treble will improve after burn in. Suprisingly good soundstage.

New batch shipped yesterday. I'm looking forward to them.

Wow, thanks for the comprehensive roundup. I just wish you had evaluated every IEM on the planet . Can anyone point me to what category might UE 600 fall into?