No more noise?
Computers, power supplies and other components tend to spit noise back onto the AC line they’re plugged into. Audio components have filtering to remove this noise, but some audiophiles feel AC power needs additional filtering before it enters an audio system. Many manufacturers offer power conditioners to perform this function. Some are little more than glorified power strips, while others include filtering and voltage regulation to clean up the power.
I’ve conducted blind tests where panelists did detect subtle improvements when these devices were used, and slight differences could even be heard between different models of AC filtering products. While many of these products don’t, in my opinion, reflect a great deal of engineering effort, one that has justifiably earned the respect of many audiophiles is the PS Audio Stellar Power Plant 3. This $2,199, six-outlet power conditioner is far more sophisticated than most competitors because rather than filtering the noise from your AC power, it completely regenerates the power to provide an exceptionally stable, clean electrical source.