Acoustic conduits; Acoustic couplers; Acoustic membranes; Amusement apparatus adapted for use with an external display screen or monitor; Audio-video receivers; Cabinets for loudspeakers; DVD players; Ear plugs not for medical purposes; Electron tubes; Electronic devices, namely, energy meters for tracking and monitoring energy usage; Horns for loudspeakers; Loud speakers; Megaphones; Microphones; Personal stereos; Radio pagers; Recording and playing devices for sound and image carriers; Sound transmitting apparatus