Tony,
Good questions.
Yes, each addition brought better sound quality in some way, otherwise I didn’t use it.
When I ran my 3 dedicated lines, I used 10-gauge wire terminated in several quad wall outlets with Furutech outlets and with Oyaide covers. I also have several 4-8 outlet heavy aluminum junction boxes that I made with Furutech outlets/inlets and 10-gauge pure silver wiring.
But most of my components are plugged into the Niagara's
I am such a tweaker...
ozzy