Audio dubbing apparatus; Electronic interconnecters for audio and video signals; Matrix switchers for audio and video signals; Distribution amplifiers for audio and video signals; Audio- and video-receivers; Consumer electronic products, namely, audio amplifiers, audio speakers, audio receivers, electrical audio and speaker cables and connectors, audio decoders, video decoders, speakers, power conversion devices, power converters, and power inverters; Signal processors; Oscilloscopes; Voltage...