Abstract: A loudspeaker system includes at least two stand-alone loudspeaker devices (1L, 1R) each comprising a frame (3) provided with a vertically oriented array (5) of first loudspeakers (7) for reproducing sound in a higher frequency range. The system further includes a second loudspeaker (13) for reproducing sound in a lower frequency range, wherein the frequency ranges have a crossover frequency fc and 750 Hz<fc<3000 Hz. The first loudspeakers each have a first radiation surface (9) in each array a central area (9a) of each first radiation surface being situated at a distance d from the central area of neighboring first radiation surface, wherein ?/fe<d<1 m, wherein ?/fe is the wavelength of the reproduced sound at the crossover frequency. The system is able of reproduce sound of high fidelity qualification.

Abstract: A loudspeaker provided with a frame (101), a membrane (103) and a drive unit (105). The membrane has an outer circumferential edge (104a) suspended from the frame and an inner circumferential edge (104b). The drive unit has a stationary part (106a) secured to the frame and a translatable part (106b) provided with a coil support (108b) secured to the inner circumferential edge of the membrane. The membrane includes a membrane body (104) which, viewed in a circumferential direction, has a pattern of folds radially extending between the inner circumferential edge and the flat outer circumferential edge of the membrane. The folds have a depth (d), which increases from the edges (104a, 104b) towards an area (104A) situated between both edges. In this area, the folds are provided with faces (204C), to which a spider (111) of the loudspeaker is secured. This loudspeaker combines a small height with a large stroke of the membrane.

Abstract: A large-excursion loudspeaker (20) comprising an acoustic member (10) and a drive unit (21). The acoustic member is intended for operation in piston mode and provided with a plate-like body (1). The drive unit is meant for translating the acoustic member along a translation axis (x) which is oriented substantially perpendicular to a main face of the plate like body. The acoustic member is suspended from a frame (23) by an arrangement of two flexible suspensions (25, 27) which are arranged at an axial distance from each other, seen along said translation axis. For manufacturing reasons the plate-like body comprises a structure of lips (3). The lips substantially extend perpendicular to said main face and are integral portions of the plate-like body. One of the suspensions is a spider-suspension (27) which is attached to the structure of lips.

Abstract: A loudspeaker (1) having a piston resonance frequency (f0) is disclosed. The loudspeaker comprises (1) an acoustic member (4) intended to operation in piston mode and provided with a plate-like body (8), (2) a drive unit (6) for translating the acoustic member along a translation axis (x) oriented substantially perpendicular to a main face (8a) of the plate-like body, and (3) a frame (2) from which the acoustic member is flexibly suspended. The plate-like body is an easy-to-manufacture polycarbonate or polymethylmethacrylate sheet (8?) having a first break-up frequency (f1) which is higher than or equal to two times the piston resonance frequency (f0).

Abstract: Loudspeaker provided with a frame (101), a membrane (103) and a drive unit (105. The membrane has a flat outer circumferential edge (104a) suspended from the frame, and a flat inner circumferential edge (104b). The drive unit has a stationary part (106a) secured to the frame and a translatable part (106b) provided with a coil support (108b) secured to the inner circumferential edge of the membrane. The membrane includes a concave membrane body (104), which, viewed in a circumferential direction, has a pattern of folds radially extending between the flat inner circumferential edge and the flat outer circumferential edge of the membrane, which pattern of folds improves the stiffness of the membrane.

Abstract: A loudspeaker unit comprising a frame (1), an acoustic panel (3), an electric exciter (5) for exciting the acoustic panel, and a tuning element (7). The panel suspends from the frame and has two substantially parallel main sides. The exciter is disposed at a first main side (13a) and comprises a stationary part and a translatable part, the translatable part being secured to the acoustic panel, the panel producing acoustic radiation upon energization of the exciter. The tuning element is disposed at a second main side (14a) and extends opposite the electric exciter and is connected to the frame. In order to facilitate the manufacture of the unit, the tuning element is provided with a mounting element (7a) extending through a passage in the acoustic panel, the stationary part of the electric exciter being mounted on the mounting element.

Abstract: A panel-shaped loudspeaker comprising a panel (1) having a first main surface (1A) and a second main surface (1B) parallel to the first main surface and further comprising an exciter (3) positioned at the first main surface. When the exciter is energized the panel is capable of sustaining bending waves and has a distribution of resonant modes of its natural bending wave vibration, which results in an acoustic radiation. The loudspeaker has a tuning element (17) extending near the second main surface of the panel and positioned opposite the exciter so as to form a resonant cavity (18) between the panel and the exciter.

Abstract: A panel-shaped loudspeaker comprising a panel (1) having a first main surface (1A) and a second main surface (1B) parallel to the first main surface and further comprising an exciter (3) positioned at the first main surface. When the exciter is energized the panel is capable of sustaining bending waves and has a distribution of resonant modes of its natural bending wave vibration, which results in an acoustic radiation. The loudspeaker has a tuning element (17) extending near the second main surface of the panel and positioned opposite the exciter so as to form a resonant cavity (18) between the panel and the exciter.