EDGE MOTION

Acoustic transducers; electroacoustic transducers; electromechanical transducers for converting electrical signals to corresponding mechanical vibrations; electronic and electrical sound production apparatus and instruments comprising acoustic, electroacoustic and electromechanical transducers that convert electrical signal energy into acoustical energy and loudspeakers or acoustic radiators used to reproduce sound by generating acoustic waves from electrical signals; electronic and electrical sound production apparatus and instruments comprising an acoustic, electroacoustic and electromechanical transducer which is actuated by sound waves and delivers essentially equivalent electric waves and incorporates a microphone or other acoustic receiver used to convert sound from acoustic waves into electrical signals