It is a device which used to amplify the volume of an earphone/headphone. It comes in handy for the hard to drive earphone and headphone which usually have high impedance and low sensitivity. Such headphones and earphones benefits a lot with an headphone AMP.
Headphone Amplifier comes in two footprints:
Desktop Amplifier used to amplify the signal of full-sized headphones which are hard to drive. In technical terms, we can say that it is used to amplify the signals of headphones which have high impedance and low sensitivity.
Portable Amplifier is used for the same purpose as desktop AMP but it is mainly used to amplify the signals of hard to drive earphones.
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