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4PCS Speaker Isolation Feet Pad Shock Absorption Amplifier Spike Isolation Feet Mat for Turntable Subwoofer Speaker Amps new hot - AliExpress
SVS SoundPath Subwoofer Isolation System (6-pack) Screw-in feet for powered subwoofers at Crutchfield
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Douk Audio 4PCS Metal Subwoofer Isolation Stand Feet Speaker Shockproof Pads Aluminium Alloy+Spring Anti-vibration Stand Mount - AliExpress
SubCone Isolation Feet for Subwoofers and Medium/Large Speakers - 4PC