Use a high quality surge protector.
Ignore the "dirty power" BS.
Dirty power is not BS. I have had some very dirty and uneven power this winter that surge protectors, and good ones were useless for in my little fist floor level system.
I have equipment to LOOK at the mains AC wave and actually measure the distortion of the wave.
I also have had UPS systems in my studio since building it, and put one in the the first floor system after multiple incidences of equipment failure this winter.
I have had to have the power company change transformers to get my distortion in the acceptable range. Even now it can get over the 5% spec.
Even when the load on the grid is down and there has been no severe whether, my UPS systems have been cutting in regularly to protect my system.
Now the audiophile loony set have said cleaning power makes their systems sound better. This is the BS part.
The problem is this rapid deterioration of America's grid causes a lot of excess equipment failure. Especially modern equipment with microprocessor control.
Now surge protectors are of no or limited value. Everyone thinks that it is just spikes that are dangerous to equipment health. Well I can tell you sags do as much damage, and so do voltage fluctuations. I have a feeling a lot of failures can be blamed on voltage sags
There was a good paper in Audio x-press within the last year with hard data showing how bad America's power is getting. If you don't have equipment to look at and measure what is going on you are taking a lot on faith.
Common problems are transformer overload, producing a wave that is nothing like a sine wave because of hysteresis distortion from transformer core overload. Inadequate filtration of the distortion caused by nonlinear loads in the substations. Inadequate neutral capacity in the grid, as non linear loads applied, by us the end users rise.
These problems will be maximal in the northern states in the winter and in the southern states in the summer.
I have recommended online smart UPS systems to power your expensive gear many times in these forums. These will clean your power a little, and most of all switch to battery and the inverted in 2ms or less if there is a rise and fall in voltage out of spec. My low voltage point is set at 109 Volts.
These systems are well worth the investment and make equipment failure much less likely.
I have been appalled at what I have found out within the last six months