Auralex LENRD - Studiofoam Corner Bass Trap (Purple / Pair)LENRD stands for Low End Node Reduction Device. As you may know, a resonance bump in a rooms frequency response is called a room node. Now, thanks to LENRD Bass Traps, you can achieve the low frequency sound control other companies cant give you! 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