Does a stereo amplifier do duplicate piece as a headphone amplifier?
Answers: I don't know what you mean by "headphone amplifier". Headphones other plug into a device that generates an audio signal, and that device have an amplifier built in that provides the power to drive your headphone speakers. If your earphones have a volume control built surrounded by, that control just decrease the signal provided by the amplifier... it doesn't have a vehicle of amplifying it.
If you plug your headphones into your home stereo system, you shouldn't entail anything more.
Your only using pre-amp signals to earpiece since the large power of speaker amplification will engineer you go deaf! Any amp next to 2 watts of power at most should be fine. Anything more than that will cook the voice coil in your telephone and give you audible range problems.
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