SVS SoundPath Subwoofer Isolation System (4-pack) Screw-in feet for powered subwoofers at Crutchfield
SVS - Why decouple your sub with the SVS SoundPath Subwoofer Isolation System? Less room rattle, cleaner, tighter output and decreased bass bleed to the rest of the house (or street) so
Svs soundpath subwoofer isolation system - YouTube