2. Does X3MKIII support Balanced output? What's definition of the port?

A: X3MKIII supports 2.5mm balanced output. Definition of the balanced output port shows as below.

Compared with 3.5mm headphone output, 2.5mm balanced output has the priority, which means when you insert the 2.5mm headphone and 3.5mm headphone at the same time, only 2.5mm headphone could output sound.