What commerical audio system tweaks provide sound quality improvement??

No "In Memoriam" category but perhaps we can establish a benefactor category where those who clean their electrical outlets without turning off the power first could bequeath their systems to other members. I would be happy to be the bequeathee!

Thanks todd, sunnyjim, and falcon. I was starting to feel a bit lonely.

No audiophile has ever been electrocuted whilst cleaning outlets, even those who employed Brillo pads, coat hangers, conductive grease or silver paste, even those who declined or overlooked turning off the power at the breaker box a priori. Even when slopping the goop on in globs. The hand-wringing is touching but save the drama for yo mama. I hate to judge too hastily but I suspect none of the hand-wringers has ever cleaned his wall outlets.

Let's be honest, you don't hate to judge, hastily or not. 

@sunnyjim you may as well try the isolation platforms under the speakers and see how they sound to you! It should be easy enough to tell by looking, though, if the added height will be a problem in terms of tweeter height. But a couple of inches shouldn't matter I would think