The present invention relates to a broadband sound absorption device using area division, the device comprising: Helmholtz resonators including a neck portion and a cavity portion connected to the neck portion and having a predetermined area and thickness; and a unit sound absorber including at least one pair of the Helmholtz resonators, wherein a plurality of unit absorbers are arranged on a plane or curved surface, and the plurality of sound unit absorbers are formed to have cavity portions with different areas to minimize the thickness while enabling sound absorption for a wider band.

A Helmholtz resonator is provided. The Helmholtz resonator includes a body enclosing a cavity. The cavity serves as acoustic compliance of the Helmholtz resonator. Further, the Helmholtz resonator includes an acoustic horn extending from an opening in the body into the cavity. The acoustic horn serves as acoustic mass of the Helmholtz resonator.

An acoustic absorption structure includes at least one cellular structure interposed between an acoustically resistive layer and a reflective layer, which includes cells and at least one partition tube positioned in one of the cells and configured to delimit in the cell two cavities forming two resonators. The partition tube includes at least two flat sides, the walls which delimit the cell into which the partition tube is inserted including at least first and second planar fixing walls against which the flat sides of the partition tube are placed and fixed, and at least two remote walls which are spaced apart from the lateral wall of the partition tube.

A loudspeaker system includes a loudspeaker assembly and a headrest having a front side and a rear side, the front side being constituted for resting a back side of a head of a person. The loudspeaker assembly is accommodated in the headrest with its front side oriented towards the front side of the headrest, the loudspeaker assembly including a first and a second driver each having a primary side and a secondary side for emitting sound, and first and second chambers, a part of the first chamber being limited by the primary side of the first driver and a part of the second chamber being limited by the primary side of the second driver. The assembly further includes a first front set of vent ducts venting the first chamber and terminating at the front side of the headrest, a second front set of vent ducts venting the second chamber and terminating at the front side of the headrest, at least one further chamber and at least one rear set of vent ducts. The secondary sides of the first and second drivers limit a part of one of the at least one further chamber or limit a part of different ones of the at least one further chamber, the at least one further chambers being respectively vented by a respective one of the at least one rear set of vent ducts terminating at the rear side of the headrest. The first and second chambers together with the front ducts form front Helmholtz resonators, the at least one further chamber together with the at least one rear set of vent ducts form at least one rear Helmholtz resonator.