Broadband sound absorber for rooms with special acoustic requirements

For rooms that should allow effortless and undisturbed speech communication, increased acoustic requirements apply. The damping of low-frequency sound components has proven to be a particular challenge. However, suitable absorbers with sufficient broadband effectiveness such as composite panel resonators occupy a large wall or ceiling area and are too bulky and expensive for many applications. In contrast, the new module presented here, which is enclosed on all sides by a partially perforated metal housing, is not only more effective but, due to its modular design and low manufacturing costs, is also suitable for a large number of room types, including acoustic renovation during ongoing operation. Measured values from the reverberation room and from the first room acoustic refurbishments confirm the theoretical expectations and hold out the prospect of a practicable solution to an omnipresent problem of building physics.