Sorry, but I don't agree with the above posts, due to my own experience.
Your electricity NEEDS TO BE CLEAN...(crap in = crap out)
First I would suggest a dedicated line WITH it's own grounding rod. (cheap AND effective) If you already have this, or can't due to living in an apartment, THEN I would suggest a P-300 with MWII. The MWII removed glare from my system that I did not realize I even had. (at first I had MWI) Plug all front end equipment into the P-300. Amps direct to the wall.
Another item that will help the ENTIRE system is a Quantum Symphony Pro emf stabilizer. This unit works so well that I have two.
People have stated that my all solid-state system "sounds like tubes".
Hope this helps.