I would second (third) the recommendation of a whole house surge protector. A licensed electrician can install one at a relatively low cost. And, given that you have a very nice (and expensive system), it makes sense to protect that as well as all the other electronic devices in your home.
But, if you don't own your home, or don't want to commit to the expense, I would recommend the Audioquest Niagra series of power conditioners. They offer good protection and won't mess up the sound (at least, IMHO).
Bob