I get it. It’s a ground wire. It shouldn’t make a bit of difference, but in this case, it did. Do I think it will make a difference for everyone? Absolutely not.I get it that the Audioquest grounding wire worked for you, but don’t get me started on audiophile grounding wires! My grounding wire is a solid core, 22 gauge “hook-up” wire that might cost a few pennies for a meter length.
Curiously, my Insight is dead quiet compared to my recently acquired Bryston BP1.5 which has a hum when in the same spot with the same wiring. The Bryston had to go to Canada for a look over, as I could never get rid of the hum.