LENRD stands for Low-End Node Reduction Device. As you may know, a resonance bump in a room's frequency response is called a room node. Now, thanks to LENRD Bass Traps, you can achieve the low frequency sound control other companies can't give you!</p><p>Bass traps substantial enough to control nodes have always been expensive to buy or intricate and time-consuming to build, but not anymore! LENRD Bass Traps are extremely effective at smoothing out low frequency room nodes at a price that anybody-and I do mean anybody-can afford! Ask your local Auralex dealer about our MegaLENRD. Twice the width and twice the length of a normal LENRD!</p><p>NRC: 1.35<br />Qty. Per Box: 8 (16 lin. ft.)<br />Adhesive: 1 Foamtak or 2 Tubetak per box</p>