JBL Olmpus speaker system

I recently obtained a JBL Olmpus speaker system (S7R). They are a pair of great speakers for pop music. I feel for classic music, the mid-range frequency sounds a little "hard" (distorsion?). Is there anybody has excperience on the issue. should they be better if I replace LE85 with 375 and add 075. another words, should s8R be better for classic music. I appreciate if anybody could comment on this.