Does power conditioning really matter?

The PS Audio Power Plant, I believe it's called, though they recently discontinued one and introduced another--completely regenerates the power...doesn't try to 'clean it up', regenerates a perfect 60Hz 120V signal.
IMHO, this is the only way to go if one can affort it (big if, as it costs about $5K, more than many, hell most people would ever even think of spending on a total audio system---though not us crazies on A'gon).

Good listening,
PS Agree with Ostemo8s premise of how it helps, entirely.
Good post.

Larry

I recently added a PS Audio powerplant prmeir to my system. I'm using a panamax 5400-pm in front to power my (2) RSW-15 subs and bring power to the regenerator. It's early yet, but I have noticed cleaner sound reproduction through digital sources. Others have listened and watched the system and don't notice much. I've also heard there is a substantial burnin period which I'm not even close to. Will let you know if the difference is more noticeable after the burnin and more testing.

Every AC source has different issues so it's not as simple a question. If your in a single dwelling it defiantly pays to add dedicated breaker buss or at least some dedicated breakers. Since digital devices are generally susceptible to RF and EMI metal clad runs from the breaker ending with shielded cables can be beneficial.

After these somewhat inexpensive measures auditioning conditioning devices could improve the AC, sometimes not.