Abstract: A personal stereo sound system device, of no larger than hand size for carrying and using on the person of at least one individual listener, has a miniaturized playback program source with control of program selection, a stereo amplifier, a volume adjuster, a power source, a multi-conductor lead for electrically connecting the amplifier to miniaturized lightweight stereo headphones or earphones, and a lead-reeling device capable of receiving and of dispensing a desired length of the lead to permit the phones to be used at a variable distance from the amplifier.

Abstract: An audio system for portable high fidelity reproduction, to provide a sensation of being surrounded by a three-dimensional field of lifelike sound events, comprises a set of miniaturized electro-acoustical devices adapted to each other and for battery-operated high fidelity reproductions and designed to be supported by or built into an interconnecting belt-like garment, so as to be worn in contact with the listener's body without causing any discomfort or encumbrance. The system may further employ one or more pairs of small-size binaural transducers with open-air high fidelity characteristics, and its circuitry is designed for binaural radiation and for optimal frequency response and perfect space reproduction through a given transducer type.