Hi, drjjpdc.
If your speakers are on spikes, a regular Cone/Spike Decoupling Glider under each spike. If no spikes, four Giant Fat Gliders under each speaker. You should get a better-defined and more linear, deeper bass on Berber than you would with cork-and-rubber sandwiches like Isol-pads, better overall sonic results, plus of course the easier mobility of the speakers.
Steve
Herbie's Audio Lab