Fosi Audio DA-2120B, User Manual, Page: 11 / 16

4: Can I use headphone with this product?
• No, the DA-2120B cannot be connected to headphones and only
supports passive speakers. when the battery power is unstable.
5: Why does the sound is cracking or make a lot of
electric noise?
• Please make sure all the cables completely pushed into the
devices, incompletely connection will cause this cracking.
• Please remove all the inputs then check whether cracking noise
disappear or not, the cracking maybe from the audio source or
input cables.
• If you are not using the original factory standard power supply,
please replace the power supply before testing. Many power
supply in the market have large interference coefficient, which
will cause a lot of current sound.
6: My Bluetooth device can’t pair with DA-2120B?
• Make sure that DA-2120B Bluetooth mode is on and “BLU”
display is flashing;
• Make sure that DA-2120B is not paired with other devices.
• Make sure that the distance between your device and DA-2120B
is not too long, put your device close to the DA-2120B to have
a try.
• Make sure there are no obstacles between your device and
DA-2120B, obstacles will affect the Bluetooth operation distance.
• Please try to change another Bluetooth audio source to test.
• Replug power supply and restart the DA-2120B and then try to
connect again, try to use another brand of mobile phone.
• Please unplug the USB flash drive, make sure no USB flash drive
plug into the amplifier.