Electroacoustic conversion device, comprising: - a first electrodynamic loudspeaker having a first diaphragm and a first electrical wire coil, - a magnetic circuit (109; 309) comprising at least one permanent magnet (27; 127A, 127B; 131A, 131B), the magnetic circuit (109; 309) defining a first air gap capable of receiving the first coil, the magnetic circuit (109; 309) being adapted to channel closed magnetic field lines passing through the first air gap, and - at least a second electrodynamic loudspeaker having a second diaphragm and a second electrical wire coil which are separate from the first diaphragm and the first coil, the same magnetic circuit (109; 309) defining a second air gap in addition to the first air gap, the second air gap being capable of receiving the second coil and being adapted so that said magnetic field lines pass through the second air gap, the magnetic circuit (109; 309) comprising: - at least a central portion (31; 231) extending from the first air gap to the second air gap, the central portion (31; 231) being adapted to channel a portion of each of the magnetic field lines between the interior of the first coil and the interior of the second coil, and - at least a peripheral portion (33; 133) extending from the first air gap to the second air gap, the peripheral portion (33; 133) being adapted to channel another portion of each of the magnetic field lines between the exterior of the first coil and the exterior of the second coil, - at least a first permanent magnet situated in the peripheral portion close to the first air gap, the first magnet preferably having a first face defining in part the first air gap, and - at least a second permanent magnet situated in the peripheral portion close to the second air gap, the second magnet preferably having a second face defining in part the second air gap. - a first electrodynamic loudspeaker having a first diaphragm and a first electrical wire coil, - a magnetic circuit (109; 309) comprising at least one permanent magnet (27; 127A, 127B; 131A, 131B), the magnetic circuit (109; 309) defining a first air gap capable of receiving the first coil, the magnetic circuit (109; 309) being adapted to channel closed magnetic field lines passing through the first air gap, and - at least a second electrodynamic loudspeaker having a second diaphragm and a second electrical wire coil which are separate from the first diaphragm and the first coil, - at least a central portion (31; 231) extending from the first air gap to the second air gap, the central portion (31; 231) being adapted to channel a portion of each of the magnetic field lines between the interior of the first coil and the interior of the second coil, and - at least a peripheral portion (33; 133) extending from the first air gap to the second air gap, the peripheral portion (33; 133) being adapted to channel another portion of each of the magnetic field lines between the exterior of the first coil and the exterior of the second coil, - at least a first permanent magnet situated in the peripheral portion close to the first air gap, the first magnet preferably having a first face defining in part the first air gap, and - at least a second permanent magnet situated in the peripheral portion close to the second air gap, the second magnet preferably having a second face defining in part the second air gap.