Fosi Audio DA-2120B, User Manual, Page: 10 / 16

Step 1: Insert the USB flash drive into the U-disk connector of the
DA-2120B;
Step 2: Press the Multi-function Knob to select to USB flash drive
mode;
Step 3: The device automatically plays the audio from the USB
flash drive;
Note: In the USB flash drive mode, please do not insert the USB
cable, some USB flash drive and USB input is not
compatible, resulting in no sound output, or amplifier
restart. Please unplug the USB cable and try again.
Troubleshooting/QA
1: Why do I feel that the amplifier is underpowered and
the sound is very small?
• DA-2120B amplifier has hardware volume adjustment and
software volume adjustment. Please make sure the volume of the
amplifier is adjusted to the maximum, and the volume of the
remote control is adjusted to the maximum.
2: Why do I get loud hiss noise coming from the TV via
optical input?
• Please turn off Dolby/DTS audio on your TV or TV App, DA-2120B
does not support Dolby/DTS audio input, please select RAW/PCM
sound.
3: Can the DA-2120B be powered by batteries?
• Yes, but it is not recommended. The amplifier may be damaged
when the battery power is unstable.