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
Amazon.com: Sonic Acoustics Soundproofing High-Density Studio Isolation Pads, Acoustic Foam Panels, Acoustic Panels For 5 Inch Monitors, Pair Of Rubber Base That Prevents Vibrations, 1.8" X 8" X 12", Pack of 2 :