I have an old Shunyata 4 outlet Hydra power conditioner bought at reduced price on Ebay. Only the CD transport and Holo May dac are plugged into it. The conditioner was not making a very noticeable difference until I plugged a Shunyata Delta AC power cord ( from dedicated line Hubbell hospital wall outlets to conditioner) into it. That made a very noticeable difference for the better. This cable is made specifically for Shunyata power conditioners and has enough pure silver in it to make it expensive.
All of the rest of my power cables are Level 3 AntiCables which I like a lot though the all copper blades need to be de-oxidized periodically.
People harp and argue a lot about cables not making a difference because how could they - they can only be as good as the mains power feeding them, but my take has always been that any wire is essentially a filter. That filtering can be executed cleanly or not.
I also made some mineralized grounding boxes (signal ground type) for the transport, dac and subwoofers and that lowered noise floor enough to distinctly hear a difference.
Tweakers have more party.