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The human ear is a design masterpiece which can cope with the tiniest sound hearable (called 0 db) to that 1,000,000,000,000 greater (called the threshold of pain) This enormous range of intensity is made manageable by taking its logarithm to base 10 and multiplying that figure by 10 Put simply, just count the zeros and multiply by 10. The 12 zeros above thus represents a sound intensity range of 120 db |