Patent ID: 7970158

Claim:
A sound system for rooms comprising: one or many long and narrow loudspeakers with membranes essentially along its entire length, extending between limits which in the room are essentially from wall to wall or floor to ceiling and that the sound is improved by prisms and cylindrical mirrors and lenses; a loudspeaker having a magnetic circuit, which forces a flux across a number of plates with slanted edges, whose edges transfer the magnetic field by plane air gaps to each other and make a cylinder with an arch formed generatrix, whose cylinder edges close the magnetic field by a structure of iron and has got its magnetic field in a known way; and conductors of strips with the one edge lying in the air gaps and the other edge provided with fingers made by slits in order to prevent sound current from going outside the air gap; and long membrane structures, which are fixed to the strips by the fingers and which structures consists of bent plates with beams in between and ribs of light material.