PylePro Model : PSI03Pro Audio Studio Speaker Risers Monitor Speaker Risers - Pro Audio Studio Speaker Riser Acoustic Sound Isolation Platforms, 9. 0 x 12. 0 -inches Features: Studio Monitor Speaker Riser Platforms Pro Audio Recording Acoustic Isolation Lab-Tested Sound Dampening Performance Perfect for On-Stage or In-Studio Use Made of Thick, High-Density Engineered Foam Reduces Vibration and Unwanted Audio Resonance Effectively Absorbs Bass Recoil Ulti-Position Speaker Mount Support Allows 'Upward' or 'Downward' Firing Sound Designed for Studio Monitors, Subwoofers, Pa Loudspeakers, Shelf Speakers Used by DJs, MCs, Sound Engineers, Instrument Players, Performers