How can I solve the harshness of my system's sound

Here is my system:
>Paradigm Sutdio 100V2
>Monster Audio spk cable
>Odyessy Stratus Amp
>Transparent Link 200 interconnect
>Hafler DH110 pre
>Arcus CD72 CD player
>Sony turntable w/ Grado cartridge
What can I do to solve harshness in the high end. I have had the problem also with my previous Power amp and CD player and when I had the system at a different location with a different shaped room. I don't know if the problem is the speakers, or are they simply revealing the limitationa of the Hafler pre, or is it something else?
Thanks