ATS Acoustics Open Back Bass Traps absorb a full range spectrum of sound wave frequencies to reduce echo within a listening space. The open wood frame design allows for noise to pass through, while the mineral wool core offers echo reduction and reduces reverberation. These panels are wrapped in ATS Acoustics exclusive line of Guilford of Maine SONA fabric for ultimate sound absorption and stunning wall decor. These bass traps are often used in professional studios, listening rooms, home theaters, home offices, and in any space that finds booming noise or echoing to be an issue. These 4" thick panels can be mounted flush against a wall, but are recommended to be mounted across a corner, allowing for the absorption of lower bass frequencies in the back of the panel. Bass absorption is especially important when recording speech or vocals, multi-instrumental music, or listening to high quality speakers in a closed space. These panels feature a Noise Reduction Coefficient (NRC) of 1.28 out of 1.0 making them the industry standard in bass absorption.