In the “Pre Out” position, the TR-amp’s volume control is activated. in the “Direct” position, the EarMen TR-amp’s volume knob is being disabled and the full-strength signal is being transferred through the”Line Out” into the external amp, which requires its own volume control. The switch serves the purpose of specifying the volume control. The EarMen TR-amp’s amplifier function can be bypassed when connecting it to a (more powerful desktop) amplifier through the 2 RCA outputs. To clarify: difference between pre-out and direct (line out) is, pre-out will make the volume control work, direct will bypass it so that line out is the full volume (will need external volume control). That little LED serves mainly as an audio format indicator, and less so than a battery indicator: EarMen TR-amp is on (“white”), connected/PCM (“green”), MQA (“magenta”), DSD (cyan), charging (“flashing blue”), and low battery (“flashing red”). The “On-Off/Volume” is nicely protruding out and therefore convenient to handle. The front panel of the EarMen TR-Amp features 2 outputs: a 3.5 mm and a 6.3 mm, which points to its particular suitability for full-sized headphones. “The music plays” – as they say – in the front and back panels… I like using it in bed with my phone, where size does not matter…at least amp size does not. The EarMen TR-amp is a rather large for use on the road – I’d store it in my pocket rather than strapping it onto my phone.
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