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Ini adalah telinga manusia. Suara yang kita dengar sesungguhnya adalah getaran udara yang ditangkap telinga. Getaran suara diukur dengan Hertz , yaitu banyaknya getaran per detik. Rentang normal telinga manusia sekitar 20 Hz hingga 20.000 Hz, dari suara bass rendah sampai nada tinggi yang tajam. Sementara kekuatan suara diukur dengan desibel . Percakapan sehari-hari sekitar 60 dB, bisikan 20–30 dB, konser bisa lebih dari 100 dB, dan di atas 120 dB telinga mulai terasa sakit serta beris...
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