6. How to use the K13 R2R as a USB DAC for mobile phones?

To connect the K13 R2R to an Android phone, player or Apple phone, you need to purchase an additional Type-C to Type-C, lightning to Type-C OTG cable (such as LT-LT3) to connect:

1. After the K13 R2R is turned on, use the OTG cable to connect to the mobile phone;

2. K13 R2R input setting: Rotate the [INPUT] knob to switch to [USB IN] mode.

(Both the rear and side USB ports can be used for USB decoding. If the two USB ports are connected simultaneously, the side one will prevail, and the rear one will be disabled.)

3. K13 R2R output setting: switch to the corresponding output port according to the interface used.

【OUT PO】Front panel 3.5mm + 4.4mm headphone output, typically connected to headphones

【OUT LO】Rear panel LINE OUT + Balanced Out with maximum fixed output volume, not adjustable, typically connected to speakers/amplifiers with adjustable volume

【OUT PRE】Rear panel LINE OUT + Balanced Out with adjustable output volume, typically connected to speakers/amplifiers without adjustable volume

【Android phone】

After the mobile phone is connected to the K13 R2R through the purchased OTG cable, the song can be played on the mobile phone. After being decoded by the K13 R2R, it is output from the headphone port to enjoy high-quality music.

[Note] If there is no sound after you connect, you need to pay attention to the following points:

1. Mobile phone playback software settings. If there is a USB output that needs to be turned on, some devices have to turn off the USB output to have sound;

2. Confirm that the mobile phone developer mode has enabled USB debugging;

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

3. Confirm that the transfer cable supports OTG function, whether the direction of the cable is reversed;

4.Please reconfirm that the K13 R2R has been switched to USB IN mode, and that the output port settings match the headphones/speakers currently in use.

5. Since the 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, it is recommended to try other mobile phones or connect to the computer DAC to rule out whether the hardware of some devices is bad (such The probability of the situation is small), if you can’t connect to the computer, you can contact our customer service for further confirmation.

【iPhone/iPad】

It is necessary to purchase a Lightning to Type C cable with OTG function (such as FiiO LT-LT3). Connect K13 R2R and iPhone/iPad/iPod, play songs and enjoy high-quality music.

【Note】

1. Only Apple devices with iOS10.0.2 and above systems are supported. Those with versions lower than this version can not be supported due to the Apple system itself;

2. When the iOS device is decoding, adjusting the volume of the iOS device is invalid and needs to be adjusted on the K13 R2R.