
• When you hand attached with the volume knob or the amplifier
case will cause some buzzing sound, it's normal because the
amplifier case and volume knob are made of aluminum, once your
hand move from the amplifier, the buzzing sound will disappear.
• 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.
5: My Bluetooth device can’t pair with DA-2120D?
• Make sure that DA-2120D Bluetooth mode is on and “BT”
display is flashing;
• Make sure that DA-2120D is not paired with other devices.
• Make sure that the distance between your device and DA-2120D
is not too long, put your device close to the DA-2120D to have
a try.
• Make sure there are no obstacles between your device and
DA-2120D, obstacles will affect the Bluetooth operation distance.
• Please try to change another Bluetooth audio source to test.
• Replug power supply and restart the DA-2120D and then try to
connect again, try to use another brand of mobile phone.
6: No Dolby/DTS audio and I still get noise through the
USB input?
• Please switch the USB port to USB 3.0 or back USB port and try
again, as some USB ports have unstable data transmission;
• Please try again with another computer;
• Please replace the PC-USB cable and retest, contact me for
compensation if the original cable is faulty;
• Please change the power supply adaptation and retest, why?
Because of the aging of the power supply, there may be an
abnormal power supply resulting in white noise. I recommend
using the 12V-24V to power it.
7: Sound quality is not good?
• Please change to another input source.
• Decrease the volume of the input audio source and increase the
volume of the amplifier.
• Please make sure your SPK OUT connects to passive speakers,
the PRE-OUT connects to the active speaker/subwoofer.
• Please adjust the treble and bass tone function to adjust the
sound quality.
• Please make sure the DA-2120D has enough power to drive your
speakers, check the specs of your speakers.
8: Why there is no voice from my amplifier?
• Recheck speaker wire connections from the amplifier to each
speaker.
• Verify that the amplifier and your source components are turned
on.
• Please check that the AC wall outlet is on and working.
• Please check that the cable from the power supply is connected
to the amp and the power supply indicator is on.
• Please check that the volume/power knob on the front panel is
turned on and not set to the minimum volume.
• Please check that your audio source(iPad, computer, etc.) are
turned on and not set to the minimum volume, please change the
audio source if you can.
• Please check that the cables from your audio sources are
working and are properly connected.