ClearSonic Portable Bass Traps 15" x 22" x 24" "The Meatball"Need a bass trap that you can move around or even store in the closet? We designed this portable bass trap to nest within our IsoPacs, drum shields and to work in the corner of your room or studio. Packing a punch with a 2. 17 Noise Reduction Coefficient, this really targets the low end bass. Designed to target the Sub bass 20 60 hz, the Low Bass 60 100 Hz, and the Low Mids 100 hz 300 hz. Designed to be placed wherever you need additional low end