Auralex's SonoLite™ SLITEBLK_PR panels are fabric-wrapped Studiofoam® acoustical absorption panels that provide excellent broad band frequency control. The SonoLite panel can be used for wall or ceiling applications and the Bass Trap panel can be installed in either vertical or horizontal orientations where walls & ceilings meet. Auralex Studiofoam Pro is used in the SonoLite panel to maximize absorption performance in it's 1" thickness. Auralex Studiofoam is used in the 3" thick Bass Trap panel to optimize low frequency performance resulting in highly effective control preventing bass build-up and cancellation that mask your room's true low-frequency character.