Amplifiers; Antennas; Autotransformers; Amplifiers for wireless communications; Antennas for wireless communications apparatus; Apparatus and instruments for conveying, distributing, transforming, storing, regulating or controlling electric current; Apparatus for recording, transmission, processing and reproduction of sound, images or data; Audio-receivers and video-receivers; Audio equipment for vehicles, namely, stereos, speakers, amplifiers, equalizers, crossovers and speaker housings; Aud...