from Audio Basics Jan 1982 #1 page 2 (
http://www.avahifi.com/images/avahifi/root/audio_basics/ab_pdf/ab1982.pdf):
5. Carefully examine the surface of the speaker that is mounted to the cabinet. Usually it is worthwhile replacing any original gasket with a thin layer of Plast-i-clay before remounting the driver, and mounting the driver firmly, but not “air wrench” tight on the cabinet surface. This will tend to slightly de-couple the driver from the cabinet, preventing remaining resonances in the driver framework from spreading to the cabinet.Does this advice apply to heavy drivers (i.e., 12"-18" subwoofer drivers weighing 40 lbs or more)?
Or is there a better approach these days? Parts Express Gasket Tape #260-540 or Speaker Sealing Caulk #260-400?
gab