Auralex SCLMCHA SonoColumn Acoustic Bass TrapControl Low Frequencies with Auralex SonoColumns Auralex SonoColumns are designed to absorb low frequency sound waves, reducing unwanted bass buildup in your listening environment. These acoustic traps can be stacked or placed in corners to improve the overall sound quality of your room. Specifications: Type: Low Frequency Acoustic Trap Placement: Walls, Corners Color: Charcoal