100*50*2cm Car Sound Deadener Noise Insulation Acoustic Dampening Foam Subwoofer Mat Car Sound Deadener Mat - Sound & Heat Insulation Cotton - AliExpress
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Pyle PSI04 - Acoustic Sound Isolation Dampening Recoil Stabilizer Speaker Riser (for Studio Monitor, Subwoofer, Loudspeakers, Shelf Speakers, etc.) 7.5'' x 9.0'', Sold as Single Unit - Walmart.com
Amazon.com: Pyle Sound Dampening Speaker Riser Foam - Audio Acoustic Noise Isolation Platform Pads Recoil Stabilizer w/ Rubber Base Pad For Studio Monitor, Subwoofer, Loud Speakers - PSI15 (15 x 15 x