i wont use the word "sibilance" for this can, on my setup....
from ipad to sansa to audiogd to darkvoice to csp2..
and over diff pads, so far nothing piercing to the extent of being sibilant...like those on the akgs.
Just reporting from my side.
(Maybe brighter upstream gears/or bright recordings might edge it towards that? just a guess. :P)