Sony NW-A306 Walkman A Series High-Resolution Digital Audio Player (Black) - Manual (Page 416)

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Note
Setting this switch to the ON position and connecting a microphone that is not compatible with a +48 V source may damage
the connected device. Check the setting before connecting the device.
Setting Description
ON
This turns on the +48V phantom power supply and sets the phantom power supply compatible
microphone as the CH-1 and CH-2 audio source.
Turn on the unit and set the type of connected device using [Audio] > [Audio Input] > [AUDIO IN Select] in
the camera menu. 4
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