The LENRD in these Auralex Acoustic panels stands for Low-end Node Reduction Device - and they're meant to spearhead room nodes or resonance bumps in particular room frequencies. Using LENRD panels， you can experience much more accurate low frequency reproduction， with an ultra-simple installation. The Auralex LENRD panels fit comfortably in your room's corners and attach to the wall easily. This is an 8-pack of Auralex acoustic LENRD panels. Plus， to best suit your live or control room's decor， Auralex offers MetroLENRD panels in charcoal， purple and burgundy. NRC 1.50.

Absorbs low frequencies to smooth out a room's overall bass response

Yields a more balanced listening environment by controlling bass build up and cancellation throughout a room

Won't crumble with age

Meets flammability standard UL 94 HF-23

Partially formulated out of soy components to reduce petroleum based chemical usage in an effort to curb dependence on fossil fuels