The AlphaCorner® Foam Bass Trap, also commonly known simply as a bass trap, is intended for low frequency sound absorption. These acoustic bass traps are commonly used in the broadcast and recording industries, as well as home theaters. These foam bass traps are all Class 1 fire rated, designed to fit into a corner of a room, come in 2" and 4" heights and both have a 12" depth. The installation of these corner bass traps is quick and simple. The acoustic bass trap can simply rest on the floor in the corners, or you can adhere the trap with water based panel adhesive or Velcro®.