A device used to help acoustically tune a room. Enclosed spaces all have resonant frequencies based upon the various dimensions of the space. As a room becomes energized with sound certain frequencies will build up or be cancelled at various locations around the room based upon its shape and dimensions. A bass trap is a low frequency sound absorber used to reduce the effects of standing waves in a room. They are usually placed in corners or along wall joints where low frequency energy tends to build up. The absorption qualities of bass traps prevent low frequencies from interfering with each other throughout the rest of the room, which results in much more accurate response in the listening area. Bass traps come in many shapes and sizes and employ a variety of construction techniques. Some are tuned to kill a narrow band of frequencies while others are designed to cover a broad range.