Abstract: An acoustic panel, designed to emit, receive, or absorb sound, includes two walls (12, 14) that are arranged opposite one another and delimiting an inner space (16), whereby the inner space (16) includes at least 50% air and is equipped with at least one cavity (16), at least one element (20) that can become deformed, elements (22) for exerting a force on the at least one deformation element (20), and elements (24) for connecting the at least one element to a surface (26) of one of the walls (12, 14), with the at least one deformation element (20), connecting elements (24) and surface (26) delimiting a chamber.