AVS Forum Special Member
Join Date: Sep 2007
Location: Toronto, Ontario
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The Sennheiser HD600 and the Dynaudios are definitely sibilance free, if you're hearing it everywhere I'd give your ears a rest, most likely a case of psychoacoustic neurosis, nothing to be ashamed of as the majority of audiophiles has fallen prey at one time or another, myself included.
Other than the source creating it, not familiar with the Asus d2x but it looks respectable, I have found on occasion oxidized connections on the speaker cable or interconnects being the culprit, they may not look dirty but give them a clean anyway.
Bearing all that it may just be matter of breaking-in the speakers, Dyns like about 200 hr+/-.