Not saying these things don't work. Either of them. Any of them. Totally absolutely trust and believe you guys are hearing what you're hearing, and it is as impressive as you say. That said, the whole marketing narrative of these things is baloney. Could give you some things to check to confirm for yourselves but I will just let you try and figure it all out from this one little tip from the Nordost page:
It is compatible with voltages from 110V to 240V
You don't say. And yet it,
"Works directly on the AC line, actively introducing a precise range of pulsed frequencies."
Yeah, no, I don't think so!