T66s sounds a lot like T88k by the looks of it.
Got my T88k's in mail yesterday, and I'm hooked
T88k got a good hint of warmth to it, but I wouldn't call it a bassy headphone by any means.
Everything sounds so natural, vocals are beautiful, imaging and seperation is very very good.
Wait a little burning.... The (pretty natural sounding) bass of this IEM is going to floor you big time