How to protect system from Electrical imbalance

In an all Solid State system, the common practive is to keep all of your electronics on at all times. I guess except for long holidays or vacations.

My questions is that what do you do to protect your system from electrical imbalances. I have found that so many of the power protectors degrade the sound. What do you do to protect your expensive system while not degrading the sound of your system?

Thanks.