Especially if you reside in a major urban power grid, there is no question as to the poor quality of the A.C. cumming into your residence. All manner of noise elements riding the AC "wave". Unless you have very expensive and sophisticated equipment that contain power supply circuitry capable of filtering out all, or at least the majority of these said elements, any set of audio electronics will benefit sonically from the use and incorporation of power management devices; ie. Scientifically designed power cords and connectors, and if you can afford it, a noise filtering power plant. There are several good ones on the market. Some that even completely regenerate the sine wave feeding your audio electronics. Simple truth. The purer and unaltered the characteristics of the AC waveform, the better your audio reproduction will sound.
Unfortunately, there are many products available on the market that claim that their design will filter and significantly reduce noise elements "riding" the AC power to your home. Some work, and some are just a scam. Same thing applies to "power plants". They all claim to be the the "end all" of your power issues, but only a few really do a superior job of what they claim. Again, like many pieces of audio equipment, it's pretty much of a "crap shoot", unless you are fortunate enough to have some place to actually obtain a honest demo. That doesn't mean that anyone interested in improving the sonic performance of their system, shouldn't try to make some educated choices to improve the quality of their A.C.
Unfortunately, there are many products available on the market that claim that their design will filter and significantly reduce noise elements "riding" the AC power to your home. Some work, and some are just a scam. Same thing applies to "power plants". They all claim to be the the "end all" of your power issues, but only a few really do a superior job of what they claim. Again, like many pieces of audio equipment, it's pretty much of a "crap shoot", unless you are fortunate enough to have some place to actually obtain a honest demo. That doesn't mean that anyone interested in improving the sonic performance of their system, shouldn't try to make some educated choices to improve the quality of their A.C.