Back about 10 years ago I decided to get serious about power delivery and purchase a more expensive than had power conditioner.
I bought a Running Springs Audio Dmitri power conditioner (around 5k new)
I was shocked how closed-in and warm it made everything. Maybe I already had to much warmth at the time and it just wasn’t a good fit. But I surely didn’t expect a power conditioner to impart such a seemingly strong sonic profile onto everything. Out it went after just a few days and I lost more reselling it than any other purchase before or since.