For me, it was about lowering noise floor, which has had a positive effect on soundstage depth, low level resolution and image dimensionality. The gear I have already demonstrates these qualities quite well but upon trying out some different power cords and using a power regenerator I was able to achieve a significant improvement in those areas without substantially altering other qualities that were just fine as is. I did try some power cords and interconnects that shifted the tonal balance or emphasized certain frequency ranges...these were rejected and not purchased or returned if purchased without hearing (or they end up in a box of unused, unloved stuff).What you write here assessor43 is interesting.
For the past few years I've puzzled over the notion of desire to change the sound of the primary components in one's system versus 'enhancing' or improving their sound. At what point does the latter turn into the former? At what point does one do, as assessor43 describes, more harm than good? When is a component no longer itself? And how do you come to realize that?
Far more questions than answers.
If a component is lacking or weak in some aspect, it seems that replacing it is a reasonable approach rather than trying something else to mitigate or overcome the weakness or to alter the component's basic character. Is the 'solution' to, for example, flabby mid-to-low bass a new interconnect or power cord, without which the problem remains extant? As I've noted before, a few, but very very few manufacturers believe another man's product is required by theirs to be its best.
Which raises the question, why do people modify their system to sound differently than it does natively, out of the box? Putting aside interconnects and speaker cables (because they are necessary for system operation) what are people's goals when introducing after-market power cords, exotic material electrical sockets, various platforms or materials or footers for equipment to sit on, grounding boxes, cable lifters. Etc. Replying "to sound better" seems obvious but unreflective.
For example, my colleague and I were looking at Wireworld cables quite closely as they offer good sound for the money and their interconnects and speaker cables are pretty good, I have found better (haven't tried the Platinums though) but they don't seem to add or omit much. Their power cables are another story. They profoundly changed the sound in my system for the worse. It seemingly removed detail, hardended the sound (distortions?) and messed with the timbre of instruments. I haven't heard much regarding power that did as much as these cables but not in a positive way (again, in MY system).