@dayglow Your experience of different outcomes when improving the input AC speaks to what someone else said about the internal power supply of the end component being more important to the equation than the power cord, et al. Any cord or cable is a purely passive device so it can only take away (filter). A well designed power supply is designed to filter, so pre-filtering might or might not have an audible affect (imo). I'm not pointing the finger at you, I just picked your response because you mentioned different end component experiences with the same source.
What difference do power cables make?
I’m considering a purchase (about $1000) that will include a power distribution box and a couple of very good cables to service my power amp and subwoofer..
For those who have upgraded power cables, how you would describe the sound quality difference in your system?
Do you feel that it was worth the additional investment?