Fiio K9 Pro - Output Connection and Audio Adjustment; K9 Pro Learning Resources; App Control and Driver Information

C. Connect the K9 Pro to the output device and select the
corresponding output mode.
D. Make adjustments to the gain and volume to suit your preference.
To Learn More
1. The K9 Pro can be controlled by FiiO Control App. For more introduction, please
visit https://www.fiio.com/
2. The K9 Pro operates driver-free on Mac OS. For Windows users, please visit our