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Pyle PSI12 - Acoustic Sound Isolation Dampening Recoil Stabilizer Speaker Riser Platform Base (for Studio Monitor, Subwoofer, Loudspeakers, Shelf Speakers, etc.) 22.5'' x 18.1'' - Walmart.com
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Pyle Sound Dampening Speaker Riser Foam - Audio Acoustic Noise Isolation Platform Pads Recoil Stabilizer w/ Rubber
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