MAX-Wall Window Kit is very absorptive even at low frequencies. It offers great broadband absorption and is incredibly linear. It’s proprietary, patent-pending design offers excellent broadband control of sound waves throughout your room and in the near field. The panels are thick enough to yield pretty high degree of sound containment, but it’ll give you enough containment so that you can lay down clean new track in hurry and likely not have to monitor on headphones. You can set up in minutes with no tools, no adhesive, no fuss and can add additional acoustic panels as needs grow.