Well, it IS pain when you're trying to afford the perfect pair of SET monoblocks AND POSSIBLY active isolation. How misguided I was thinking my last purchase (Soundsmith Straingauge cart) was going to be my last. What I find interesting is that NO passive racks I had auditioned ever made any significant improvement over my previous low tech rack...UNTIL i tried the Symposium Isis. I can't gauge if this means that isolation is or isn't an issue in my room (if it is, how come no other racks like the Grand Prix Monaco sold themselves?). Power, however, was another matter, with every upgrade (basic mains to dedicated spur to audiophile conditioner to overkill balanced power to addition of dedicated component grounding) proving a significant improvement.
I live in a rock solid 1930s reinforced concrete industrial loft apartment building with solid floors which is a pretty inert listening environment, no listing/yawing I think, 3 floors up. Even when a new housing estate was being built opposite over a couple of years, I detected no subsonic feedback in my system from piling, hammering, drilling etc. I also do most of my listening during the day when neighbours are out. So I've got a reasonable chance that environmental subsonic noise is not the major issue it could be. Hence, at the trial of active isolation, I will be gobsmacked if one of these shelves demonstrates subsonics are major issues by eliminating them well beyond what the Symposium does. Possibly movement in floors could be an issue (suspended timber over concrete substructure)
Price is a major issue, and the tenor of what Mike and Christian are suggesting is that ALL components could benefit massively, not just source components. I can just forsee stretching to isolating my tt and cd, but NO way could I afford shelves for psu's, preamp, 2 monoblocks, balanced transformer, grounding box etc. Passive Symposium has been delightfully beneficial, but even that was a stretch financially.
Mike, PLEASE let us know of your experience putting a Herzan under the cd and/or preamp. If the improvement is commensurate with the NVS, how can you stop yourself not extending shelves to your monoblocks?