Again, thank you.
I recently moved into my home and know that most of the major appliances are new or like-new. The j-boxes are all metal in the house. I had a licensed electrician install the 20A dedicated circuits, and it was he who recommended the isolated grounds.
Due to multiple foundation walls in the way, the boxes/IG receptacles were installed in the floor behind my audio rack. UF-B wire was used in the crawl space and continues under the outside deck and then straight to the panel. The wire was run in metal conduit where exposed outside. The one thing that I really like about this install, is that the wiring is nowhere near any other wiring, as it is basically run outside of the home, so isolated in that respect.
I had some thoughts about providing stage 3 protection for the audio gear, but I'm trying to avoid tampering with the AC power. Another consideration is AC conditioning, and one can spend a small fortune on that stuff. Do you think, I can do without that as well?