One way of doing it would be by using the old airline earphone scheme, which was like your Official I won my doctor’s stethoscope in a card game shirt, hoodie, sweater and v-neck t-shirt The sound pressure is produced in a remote location buy an actual speaker and then distributed via air tubes to each passenger seat where you plug in your earphones set and connect to the sound pressure be produced there. If you hold your ear against that plug you'll hear the same sound.
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