At your risk. Protect your ears. Even more than half milliwatt feeding headphones can be dangerous.
For example the Sennheiser HD580 should produce more than 90dB fed by 1 milliwatt.
See a previous post on Pleiades V5 2 stage battery powered mic amplifier feeding a Pleiades 2N3054 posered by 1.3V.
More experiments to come, for example a signal path such as:
Pleiades V6 - Pleiades K117 - Pleiades 2N3053
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