On the subject of power regenerators, I thought the
PS Audio P12, which I had in my system for about two years, was pretty good, but also a mixed bag. I've posted about this in the past, but let me recapitulate...
Its effects on sound quality were both good and bad. This is the worst kind of outcome, where you have to weigh the pros against cons, leading to much hand-wringing.
It resulted in a more detailed, cleaner sound, a blacker background, stuff like that, which I really liked, and valued a lot. But also leeched out the bass just a bit, as well as the dynamics in general just a bit. Enough to be noticeable.
These qualities (both the good and bad) were more apparent using some devices more than others. I felt like it was more negative than positive when used with the Benchmark HPA4 as well as the Bakoon AMP-13R, making both brighter and less dynamic. With the Bakoon in particular, the lessening of dynamics and bass was a problem with the Susvara, so I always left that amp connected to the mains. I did think the P12 was quite positive with the DAVE DAC I had at the time, with no perceivable negatives. That was the main reason why I kept it so long, but at a certain point, it was the only device I was using it for, which seemed a bit much. Though I also thought it was an easy net positive with my Pass Labs speaker amp as well.
Last thing worth mentioning on sound is that even with all components connected through the P12, the sound quality remained dramatically better late at night compared to the middle of the evening, so that observation alone tells me it was not doing close to enough to what would be ideal. Totally understandable, but still...
Lessee, what else... It consumes about 20% more power than what would otherwise be required (if I remember the number correctly, but it's somewhere along those lines), so that's something to keep in mind. Also, it has a fan, but I never noticed it get hardly even warm and never heard the fan spinning. And I was pushing maybe 250-350 watts or more through it regularly for a while (speaker amp, tube amp, and DAC).
Also, the graphics visualization displayed through the touchscreen which shows the "before" and "after" sine waves is pretty cool, and kind of comforting, lol.
I've since moved on to the more modest (in both size and price) AudioQuest Niagara 1200, which I like a lot better. To start with, it somehow manages to
first do no harm (imagine that!), at least with my system and with my power situation. I would totally recommend it as being worth a try, if only because it's a lot cheaper, and can be easily returned if gotten through Amazon (in the U.S. at least).