headphones

Headphones are a human-made electroacoustic device comprising a pair of miniature loudspeakers (drivers) in earcups, or a single housing containing two drivers, mounted on a headband or ear hook and worn by one listener to convert an electrical audio signal into sound pressure delivered directly to the ears. Parameters: (1) transduction — dynamic, electrostatic, planar-magnetic, or bone-conductive drivers; (2) coupling — over-ear, on-ear, or in-ear seal controlling acoustic isolation; (3) channel configuration — mono or two independent channels (stereo); (4) connectivity — wired (3.5 mm jack, USB) or wireless (radio, Bluetooth); (5) form factor — circumaural, supra-aural, or intraural. The persistence mechanism is industrial: the form is designed, mass-manufactured, and sold through retail channels as a durable consumer product category; individual units die in replacement cycles, but the category persists through continuous production, interface standardization (jack sizes, radio protocols), and the consumer-ownership cycle that keeps the form in daily use across decades. [formal: auditubera | substrate: matter | horizon: generations | explicit: yes | epoch: 0.15]