Auralex MAX211PUR MAX-Wall 211 in Purple; 2- 20x48x4.75 Panels; 1- 20x48x4.75 Window Section in Clear Plexiglass Only; 1- MAX Stand The MAX-Walls perfect if youre renting a space and dont want to-or arent allowed to - mount anything to your walls, or if your place needs to serve a variety of acoustical purposes. MAX-Wall offers you great flexibility in a big hurry The MAX-Wall is very absorptive, even at low frequencies. It offers great broadband absorption and is incredibly linear, with an overall NRC of 1.05! The MAX-Walls proprietary, patent-pending design offers excellent broadband control of sound waves throughout your room AND in the near field, so now you can play, record or mix great music or vocal tracks ANYWHERE at ANY TIME!