It is great to have your opinion in this thread Alan, thanks a lot!! And it is true, I mostly listen to rock music (power metal more specifically), but I can hear sibilance in other recordings as well, such as Sade, Depeche Mode... I would really appreciate if you have any short-term solution advice for my case. You can find more information on my listening room, equipment, etc in this thread.

Axiom M60s, QS4s, VP100 Onkyo TX-SR804 Oppo 970HD Rotel RB-1080/RCD-1072 REL Q150E sub, PS 3