What you really want is louder audio, and a way to do that is to make your speaker more efficient.
In short: You can't amplify the power without another source of power. So, if you could somehow convert the power in the headphone jack into something useful and convert it back into a form for driving a speaker, and could do it with 100% efficiency then you would end up with exactly what came out of the headphone jack in the first place. The power in a headphone jack is also AC and in the frequencies that you want for your audio! There is no additional power contained in a headphone jack other than the audio itself. The power in a normal wall outlet is 50/60Hz AC.
Here's the thing: The power in the headphone jack is in the audio itself. Is it possible to use the power from the headphone jack line out toĪmplify the signal in order to get the speaker to be louder?
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