At least two closely spaced identical or similar loudspeaker assemblies in a horizontal linear array, each loudspeaker assembly comprising at least two identical or similar loudspeakers pointing in different directions so that the loudspeaker assemblies have adjustable, controllable or steerable directivity characteristics. For example, a control module may drive, adjust, control, or steer the loudspeaker assemblies so that at least one acoustic wave field is generated at least at one listening position.