Test # 119
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Precautions while using Earphones
The sensitivity factor of a headphone amp determines how loud it will play when a certain wattage of power is inputted to it. Also known as efficiency, this value will be stated at the top of the package as a certain decibel level that is achieved with one milliwatt of power. Most efficient headphone amps will provide more than 100dB for every one mV of power.