And the aspect it inadvertently may have helped should have been fixed by proper troubleshooting and typically something simple like plug all devices into the same power distribution branch circuit in your house or a DI box etc... $6,000 to solve an "off label" problem is just ridiculous. I say "off label" because we all know they advertise it's major function as "cleaning" your power. People picture in their minds it's a filter that takes something polluted and filters the pollutant out and you're left with something clean that can be consumed. In this case it "cleans" the electricity so the music is "purer". I can completely understand how this sounds legit from a layman's pov, but from someone that understands how electronics function the notion is obviously ridiculous. Now add in golden ear consumers that can "critically listen" that say they can hear a difference for the better and that "confirms" the propaganda in the advertising and the result is us arguing over it on the internet.
The problem with critically listening is you're imagination runs unchecked. You may hear something you literally just didn't notice before because you were focusing in on say the drums the last time you heard that same moment in the recording but now you're listening to and focusing in on the piano. Something........actually literally anything can pop into your perception at any given time but doesn't mean it wasn't there before or it also doesn't even mean it's there at all. High quality calibrated test equipment is the only way to accurately and repeatably collect data to analyze and make a discovery.
I am probably the last person to need a power conditioner as traditionally my gear has had outboard power supplies.
And I am also close to the last person that would use one.
My main point was that the DC offset could have been measured, as it is an area where it could be perceived in reduction of transformer hum.