Perforated devices and glazings comprising same

A glazed unit comprising at least two glazed walls forming between them a cavity, wherein the cavity comprises at least one device comprising at least one plate, said plate comprising a plurality of perforations arranged periodically and delimiting a chamber arranged in the cavity, an absorbent material being present inside the chamber, wherein the plate and the chamber are configured to resonate at a low frequency lower than 300 Hz and a ratio of a surface area of all the perforations arranged periodically and a total surface area of the plate including a surface area of the perforations is from 0.01% to 8%.