Audio speakers; Apparatus for transmission of sound; audio equalizer apparatus; Speaker boxes, namely, audio speaker enclosures; Headset virtual reality device, namely, virtual reality headsets; Sound couplers, namely, acoustic coupling devices; Audio and video receivers; Earphones; Stereo tuners; Audio amplifiers; Electronic switchers for audio signals; headsets for use with computers; Voice transmission apparatus for use with personal headsets; CD players; Wireless headsets for smart phones...