Line source loudspeaker device

A line source loudspeaker device configured to be placed in a first and a second position, wherein the first position is substantially orthogonal relative to the second position, the line source loudspeaker device comprising:

• a housing which is provided with a first loudspeaker and one or more second loudspeakers, wherein the one or more second loudspeakers are arranged on either side of the first loudspeaker, wherein the first loudspeaker is configured to emit first frequencies and the one or more second loudspeakers are configured to emit second frequencies, wherein the first frequencies are higher than the second frequencies;
• wherein the first loudspeaker and the one or more second loudspeakers each comprise a driver and a corresponding loudspeaker output, wherein each driver emits a substantially spherical sound wave and is connected to the corresponding loudspeaker output, wherein the loudspeaker outputs together form a combined loudspeaker output of the line source loudspeaker device, and
• an acoustic waveguide which is provided between the combined loudspeaker output of the line source loudspeaker device and the first loudspeaker, wherein the acoustic waveguide is configured to guide the sound waves emitted by the first loudspeaker over a constant wave path defined by the acoustic waveguide, such that the initially spherical sound wave is converted into a substantially rectangular isophase sound wave which interferes constructively with the sound waves of the one or more second loudspeakers so as to form a substantially cylindrical sound wave together;
• wherein the acoustic waveguide is configured to be rotated about an axis which is coaxial with the driver of the first loudspeaker, such that, in the first and second position of the line source loudspeaker device, the cylindrical sound wave propagates only in a substantially horizontal direction.