Take Me to School (Understanding Audio Better)

Again … the problem with using amplifier outputs to drive other amplifiers, is the noise and distortion from the driving amplifier being re-amplified, with more distortion in the driven amplifier.

This is exacerbated if the driving amplifier is working at, or near, it’s limits, which is generally where it performs at its worst.

It can be preferable, still, if the output from your source is only available as a headphone output, and it doesn’t have enough power to drive the headphones in question properly. But it won’t be as good as a proper line-out.

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