Abstract: A loudspeaker rigging apparatus (100) for suspending a plurality of loudspeakers from temporary or permanent structure. The loudspeaker rigging apparatus (100) comprises a beam (102) configured to be secured to an uppermost speaker in an array of speakers (106) and a trolley (121) coupled to the beam (102) and moveable along at least part of a length of the beam (102). The trolley (121) comprises a rigging point (110) configured for connection to the rigging or scaffold, and the beam (102) may be angularly displaced with respect to a horizontal plane when the rigging point (110) is connected to the rigging or scaffold.

Abstract: A loudspeaker rigging apparatus (100) for suspending a plurality of loudspeakers from temporary or permanent structure. The loudspeaker rigging apparatus (100) comprises a beam (102) configured to be secured to an uppermost speaker in an array of speakers (106) and a trolley (121) coupled to the beam (102) and moveable along at least part of a length of the beam (102). The trolley (121) comprises a rigging point (110) configured for connection to the rigging or scaffold, and the beam (102) may be angularly displaced with respect to a horizontal plane when the rigging point (110) is connected to the rigging or scaffold.

Abstract: A loudspeaker (100) comprising: an electro-magnetic motor (114) configured to receive electrical signals and, based on the received electrical signals to induce vibrations in a diaphragm (116) for generating a pressure wave; a surround (118) connected to the diaphragm for suspending the diaphragm from a driver chassis (120); and a damper (126) in contact with the surround for damping the vibrations in the surround and the diaphragm.

Abstract: A bracket for attachment to a first speaker and for suspending a second speaker therefrom. The bracket comprises a suspension member configured for attachment to a second speaker and defining an axis about which a second speaker is free to rotate when attached to the suspension member and an adjustable end stop configured to limit the maximum amount of rotation of a second speaker about the axis of rotation.

Abstract: A loudspeaker (100) comprising: an electro-magnetic motor (114) configured to receive electrical signals and, based on the received electrical signals to induce vibrations in a diaphragm (116) for generating a pressure wave; a surround (118) connected to the diaphragm for suspending the diaphragm from a driver chassis (120); and a damper (126) in contact with the surround for damping the vibrations in the surround and the diaphragm.

Abstract: A bracket for attachment to a first speaker and for suspending a second speaker therefrom. The bracket comprises a suspension member configured for attachment to a second speaker and defining an axis about which a second speaker is free to rotate when attached to the suspension member and an adjustable end stop configured to limit the maximum amount of rotation of a second speaker about the axis of rotation.

Abstract: A loudspeaker is disclosed in which a cone driver operates into one end of an acoustic channel having acoustically closed sides and an acoustically open front. A longitudinally extended member is mounted directly in front of, and in alignment with, the driver, so as to restrict the free space within the channel. The rear of the longitudinally extending member effectively extends within the voice coil former, such that the volume defined between the rear of the longitudinally extending member and the loudspeaker is an annulus. The profile of the longitudinally extending member differs in its vertical and horizontal planes so as to provide a lower acoustic impedance in one plane than in the other.

Abstract: A loudspeaker comprises an electroacoustic driver in an enclosure having upper and lower ends. Plates are provided at one end and fixing devices are provided at the other end of the enclosure. The plates have holes which allow them to pass over fixing devices of a vertically adjacent loudspeaker. Each of the fixing devices comprises a pillar for passing through the hole of the plate of a vertically adjacent loudspeaker and a locking element connected to the pillar and moveable between an unlocked position for passing through the hole and a locked position for holding the plate on the pillar.

Abstract: A loudspeaker comprises an electroacoustic driver in an enclosure having upper and lower ends. Plates are provided at one end and fixing devices are provided at the other end of the enclosure. The plates have holes which allow them to pass over fixing devices of a vertically adjacent loudspeaker. Each of the fixing devices comprises a pillar for passing through the hole of the plate of a vertically adjacent loudspeaker and a locking element connected to the pillar and moveable between an unlocked position for passing through the hole and a locked position for holding the plate on the pillar.

Abstract: A method of laser-drilling a hole through a workpiece, such as an injector nozzle (40), into a cavity comprising drilling a hole (41) through the workpiece (40) with a laser (50), providing a fluid having laser-barrier properties in the cavity so that, when the hole (41) is open to the cavity, laserlight passing through the hole (41) is incident upon the fluid whereby the workpiece (40) across the cavity from the hole (41) is protected from the laserlight, and arranging that the fluid does not enter the laser-drillled hole (41) during the drilling process. Apparatus for performing the method is also described.