FULLRANGEMAN: I don't recommend Sorbothane, or Sorbogel, anywhere in an audio system. The material virtually always introduces some sonic anomalies into the vibrational environment. Its contravibrational energies are too slow to tame higher frequency acute vibrations that cause a lot of the glare and grunge in audio. At best, it's a trade-off material, attenuating some resonances while introducing others; at worst, it's literally an audio contaminant that will keep your system from performing at its best potential. It's not a material specifically designed for audio isolation.
On top of speakers, a granite slab usually does very well, with Herbie's "Thin" Fat Dots between slab and cabinet to neutralize any character of the granite. On top of a CD player, Herbie's SuperSonic Stabilizer is great for microvibration control, especially if used in conjunction with compliant Tenderfoot isolation feet under the player.
Steve
Herbie's Audio Lab
