Get Jim Smith's book Get Better Sound for guidance on system setup and room treatment.
My system started out Krell and Oppo with no room treatment and lots of hard, reflective surfaces. The sound was bright, shrill and awful.
Now my current system sounds wonderful because:
Setup per Jim Smith's suggestions
Room treatment
Different amp
Krell and Oppo products typically sound very clean, clear and analytical but can become bright and shrill without proper setup and treatment.
Hope this helps.
Tom