6. How does K9 connect a mobile phone with USB DAC function?

K9 does not have a battery and is powered by a built-in linear power supply. You can additionally purchase OTG to connect to Android phones, Apple phones or players

[Android phone]]

1.K9 input setting: K9 [INPUT] switch to USB gear

2.K9 output setting: switch to the corresponding output port according to the interface used, the front panel switches to [PO], and the rear panel switches to [PRE] or [LO]]

3. Connect the mobile phone to K9 by type-C USB to square data cable (such as LD-TC3)

[Note] If there is no sound after you connect, the following places should be paid attention:

1. Mobile phone playback software settings. If USB output needs to be turned on, some devices will have sound only when USB output is turned off.

2. Confirm that USB debugging is turned on in mobile phone developer mode

The mobile phone needs to open USB debugging, open "Developer Options", and then open "USB Debugging" or "OTG" function

3. Confirm that the adapter line supports OTG function and whether the line direction is reversed

4. Since USB audio of various brands of mobile phones is not standardized at present, FiiO does not guarantee full compatibility. According to the above connection method, if it is not supported, try other mobile phones or connect computer DAC to exclude whether the hardware of individual devices is defective (the probability of such cases is small), and if the computer is connected, repair or replacement is not considered.

[Apple phone/iPad]]

you need to purchase a Lightning-to-TypeC cable with OTG function (such as LD-LT1) to connect K9 and iPhone/iPad/iPod to play songs and enjoy high-quality music.

[Note]]

1. Apple devices that only support iOS10.0.2 and above systems, and those that are lower than this version cannot be supported due to Apple's own reasons.

2. When the iOS device decodes, adjusting the volume of the iOS device is invalid