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Why does the A 20 have an output impedance of 100 ohms?

There are two reasons for the output impedance of 100 ohms:

  1. It protects the A 20 from damage in the event of a short circuit on the headphone side.
  2. When using headphones that have different impedances one after the other, the jumps in volume level are much lower than if a very low output impedance was selected.
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