1. AK380 Cradle is available for AK380 v1.14 or later,

AK300/320 is available for v1.00 or later firmware version.

2. When Device is connected to the cradle and the clamp is raised and activated (See below picture)

It outputs to the XLR balance of the cradle, 

and it does not sound even when connecting earphone to 3.5 terminal and 2.5 terminal of AK380/A320/AK300 main body.

3. When using the AK380 Cradle as a USB DAC, the XLR balanced output will not be out.