The treble is pretty overwhelming on these guys.  I usually EQ the top band down a couple of dBs.  But the soundstage is pretty crazy for an IEM (in my limited experience).  I had bass problems with these things for the longest time, but I finally found some tips that do the pieces justice.  I'm using the Shure Flex series.  The foams just didn't do it for me.   I will say, I think my right earpiece is quieter than the left, which is discouraging.  I've tried switching sides to verify the problem, and I think it's definitely the headphone volume...