Foam pipe insulation.
Available in 3/8", 5/8" or 7/8" to accommodate most speaker cables and 6 foot lengths so you can choose whatever length works best.
At $4.50 each it works out to under $0.20 each for 3" cable risers.
Walmart, 97 cents, for Vibration Control
Simply place on components, or wrap around cables and plugs. As with footers, location counts. The more resolving systems will benefit. The "Fuzzy Sticks" resemble pipe cleaners, but they are lighter, thinner and less rigid. This means they can be folded, bent in spirals, and cut with a scissors.
Prepare to be astonished. What music lover doesn't have micro-vibrations they would prefer to eliminate?