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How Loud Are Bullhorns and ThunderPower Megaphones, by Decibels?

The chart below shows how loud each ThunderPower megaphone is compared to other common noises. For every 10 decibels the loudness doubles. For example, 110 decibels is twice as loud as 100 decibels.

*The measurement was taken 6 feet away from the megaphone. The measurement of other sounds is an average of the low and peak measurement. Source: Noise Navigator*