Patent ID: 11910153
Assignee: PSS BELGIUM NV
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A seat assembly including a seat and a dipole loudspeaker for producing sound at bass frequencies, the dipole loudspeaker including:
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 at bass frequencies such that the first and second radiating surfaces produce sound at bass frequencies, wherein the sound produced by the first radiating surface is in antiphase with sound produced by the second radiating surface;
a frame, wherein the diaphragm is suspended from the frame via one or more suspension elements, wherein the frame is configured to allow sound produced by the first radiating surface to propagate out from a first side of the dipole loudspeaker and to allow sound produced by the second radiating surface to propagate out from a second side of the dipole loudspeaker;
wherein the diaphragm includes a region of porous material having a specific airflow resistance in the range 50-500 Pa·s/m, wherein the diaphragm is configured to permit airflow through at least part of said region of porous material from the first radiating surface of the diaphragm to the second radiating surface of the diaphragm;
wherein the seat is configured to position a user who is sat down in the seat such that an ear of the user is located at a listening position that is in front of and 30 cm or less from the first radiating surface of the diaphragm.