THE RANGE LIMITER ADD A MEMBRANE FOR EVEN MORE LOW FREQUENCY ABSORPTION.
This option includes a membrane system which starts absorbing at a lower frequency but also has a cut off starting around 400Hz. Using the Range Limiter option ensures maximum low end absorption while retaining nearly 100% of the upper frequencies within your room.
Ideally used when no upper frequency absorption is required/desired. The Range Limiter option is an ideal solution to make a small room sound larger, keeping life within the room.