Panel-form loudspeaker having cellular-based core with cell size dependent upon functional upper frequency limit

摘要

To overcome acoustic distortion caused by local resonance in panel core cells, a resonant multi-mode radiator element is provided for a panel form loudspeaker with a functional upper frequency limit max. The element has skins and a cellular based core, the skins have a thickness h, a Young's modulus a Poisson's ratio of and a material density rho and the core has a cell size lcell characterized in that the cell size lcell is less than equation (2).