Loudness
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| 7
1. Ear Drum
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Loudness
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| 7
2. Sound Pressure
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Loudness
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3. Increasing Distance
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Loudness
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4. Booster
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Loudness
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5. Ear Protectors
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Loudness
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| 7
6. Two Machines
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Loudness
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7. Phon Scale
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