music, headphones, listening, headset, closeup, sound, call, earphone, listen, ear, impedance, input, sensitivity, driver, working, output, frequency, white, hear, entertainment, technology, head, speaker, black, corded, comment, sensory activity, excavation, electric resistance, resistance, hearing, engineering, sense, telephone receiver, ratio, application, shout, production, statement, relative frequency, profession, photograph, diversion, articulator, electrical device, faculty, yell, electrical phenomenon, commerce, remark, transaction, sensing, industry, cry, yield, person, transducer, electro-acoustic transducer, outcry, utterance