I drilled holes in ivory billiard balls and ran my cable through them every 18" in 6 ft runs. Tremendous improvement. It made Bob Dylan sound like Frank Sinatra.
Brilliant Pebbles, a new tweak, cheaper than high end cables.
"Brilliant Pebbles is a unique and comprehensive system for tuning the room and audio system based on special physical properties of highly symmetrical crystal structures.
Brilliant Pebbles addresses specific resonance control and RFI/EMI absorption problems associated with audio electronics No snake oil here.