21.How to use the USB DAC function in S15?
The USB DAC function requires a connection through the USB DAC port on the front panel. The other USB ports in S15 do not support USB DAC.
Connecting S15 to Computers
[Windows PC]
1. Install FiiO USB DAC Driver
Download driver v5.68 or newer: https://forum.fiio.com/note/showNoteContent.do?id=202105191527366657910&tid=17
2. S15 Input Settings
Long-press the right knob to switch to USB DAC Mode.
Connect the S15’s front-panel Type-C USB DAC port to the PC using a USB cable.
3. S15 Output Settings
Select the desired output:
BAL.LO/LO Output(Please disable the I²S switch)
Coaxial/Optical/AES Output(Please Enable the corresponding output switch)
I²S Output(Please enable the I²S switch)
4. PC Audio Configuration
Set System Audio Output and Media Player Output to "S15".
Play music through supported software (e.g., Foobar2000).
5. Playback Tips
How to play lossless/DSD files: https://forum.fiio.com/note/showNoteContent.do?id=202105281106126083841
[MAC]
1. No driver required. Connect S15 to MAC via USB, then select "S15" in System Preferences > Sound > Output.
2. Volume Control: Set macOS volume to max, adjust output level via S15’s knob.
Detailed setup:https://forum.fiio.com/note/showNoteContent.do?id=202105191616354037331
[Linux]
Driver-free but compatibility varies by distribution.
If unrecognized, please try alternate USB ports/cables.
Connecting S15 to Mobile Devices
[Android Phones/Players]
1. Connect S15’s USB DAC port to the Android device using an OTG adapter cable (e.g., FiiO LT-TC/LT-LT series).
2. S15 Settings:
Long-press the right knob to switch to USB DAC Mode.
Configure outputs as needed (see Output Settings above).
3. Play music on the Android device to enjoy high-quality audio.
Note:
1. App Settings: Enable "USB Audio Output" in your media player (some apps disable it by default).
2. Android-Specific: Activate Developer Options → Enable USB Debugging/OTG.
3. Hardware Checks:
Ensure the adapter supports OTG functionality.
Verify correct cable orientation.
4. Compatibility Note:
Due to non-standard USB audio implementations across Android brands, full compatibility isn’t guaranteed. Please test with alternate devices or PCs to isolate issues.
If problems persist, please contact FiiO support.
[iOS Devices (iPhone/iPad)]
1. Use an OTG adapter (e.g., FiiO LT-TC/LT-LT series).
2. Enable iOS Decoding option in S15’s USB DAC settings.
3. Play music directly from the iOS device.
Notes:
1. Requires iOS 10.0.2 or later. Lower versions are not supported.
2. Volume control could be adjusted via S15’s volume knob (The volume in iOS device is disabled).