Loudspeaker

A seat assembly that includes:

• a headrest;
• one or more mid-high frequency loudspeakers, wherein the/each mid-high frequency loudspeaker includes:
• a diaphragm having a first radiating surface and a second radiating surface, wherein the first radiating surface and the second radiating surface are located on opposite faces of the diaphragm;
• a drive unit configured to move the diaphragm based on an electrical signal;
• a loudspeaker support structure, wherein the diaphragm is suspended from the loudspeaker support structure via one or more loudspeaker suspension elements;
• wherein the loudspeaker support structure comprises a self-supporting porous shell which encloses a volume configured to receive sound produced by the second radiating surface, wherein at least part of the self-supporting porous shell is provided by at least one self-supporting portion of porous material having a specific airflow resistance in the range 500-5000 Pa·s/m so as to allow sound produced by the second radiating surface to exit the volume enclosed by the shell;
• wherein the/each mid-high frequency loudspeaker is configured to produce sound across a designated frequency band that includes at least 500 Hz-2 kHz has, within the designated frequency band of 500 Hz-2 kHz, a directivity index that is 3 dB or more.