I still am of the opinion that other parts of your setup are not allowing the speakers to do what they should. Is there a reason why you won't reveal the source, amp and preamp?
I don't mean to be pushy, but speakers are dependent upon the signals given to them. An inaccurate signal will be propagated by the other components and make any speaker sound less than what it could reproduce.
I don't mean to be pushy, but speakers are dependent upon the signals given to them. An inaccurate signal will be propagated by the other components and make any speaker sound less than what it could reproduce.