I have tried many power conditioners in several homes in different geographical locations over about 40 years compared to the wall. The wall has always sounded better for amplifiers. I even tried a high end power conditioner made for amps… also worse.
The best quality sound with few exceptions is to have the amp(s) connected directly to an outlet with a dedicated line and the other components through a power conditioner powered from another dedicated line. There are rare exceptions where the power conditioner to the none amp does not improve the sound. This is rare and thought to be the result of living in an area / house with exceptionally clean power.
Typically the difference is pretty easy to hear.