Fiio K3 - Scene 2: Connect to Speaker;Amplifier

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Scene 2: Connect to active speaker or amplifier with a 3.5mm audio
cable
note：
 line out is controlled by the power/volume knob and can work with
2.5mm/3.5mm output at the same time ; but recommend to eject the
2.5mm/3.5mm headphones while using the line out.