Nobsound TA-21 User manual

Address: Room 1329, Wang Cheng Building, Long Guan street,
Long Hua new District, Shenzhen, Guang Dong, China
Contact: LIU CHENXI Tel: [phone] Email: [email protected]
CONTACT INFORMATION
Brand: Nobsound
Model: TA-21
Audio input: 3.5mm AUX / Bluetooth
Audio output: banana speaker jacks
Bluetooth version: 5.0
Max output power: 100W+100W
Amp IC chip: TPA3221
Matched speaker: 3''-10''/ 4-8Ω
Frequency response: 80Hz-20KHz
Working voltage: DC 9V-24V / 3A or above
Minimum input power: 50W
Dimensions(W*D*H): 90*78*23mm/3.54*3.07*0.91in
Net weight: 143g/0.32lb
Package weight: 600g/1.32lb
PARAMTERS
+
-
+
-
R L
DC9V-24V IN
+
-
FRONT AND REAR PANEL
+
-
+
-
R L
+ -
DC9V-24V IN
+
-
Power input: DC9V-DC24V
This amplifier requires 50W power supply at minimum,
its auto power-off during use means that your speaker needs high
power supply to drive, please turn down the volume or change
another power supply with higher output.
Right channel Left channel
AUX
7
6 8
Input indicator
Blue--Bluetooth input
Green--AUX input
4
AUX input
5
Volume -
Volume +
6
3
Power button (long press)
Play / pause (short press)
Volume LED display
2
1

1. Connect the power supply to the amplifier firstly and then plug it into the socket to
avoid generating electric sparks.
2. Wireless Input
● Correctly connect passive speakers to the amplifier output with high-quality cables.
● Long press the power button 2S to turn it on, the indicator will be flashing blue(BT mode).
● Turn on your audio source’s Bluetooth function, search and click to connect. Blue
indicator will be always-on after successful connection.
3. Wired Input
● Correctly connect your audio source to the amp input with high-quality AUX cable,
and connect passive speakers to the amp output.
● Long press the power button 2S to turn it on, and the indicator will be steady on
green(AUX mode).
4. Then through buttonsyou can adjust the volume, play or pause music.
1. Please connect the power supply to the amplifier firstly and then plug it into the
socket to avoid electric sparks but this condiction is normal and safe and no harm
to the amp.
2. Default comes with power supply( 12V/5A Max Output 60W), it is enough to drive
most home speakers. And speakers with bigger power please change larger power
supply(DC 9-24V).
3. When plug in AUX cable, the blue indicator(BT mode) will turn green(AUX mode),
it will default select AUX input. If you want Bluetooth input, please plug out AUX cable.
HOW TO USE
FREQUENTLY QUESTIONS
WARM TIPS
Douk Audio TA-21 Mini
Bluetooth 5.0 Digital Amplifier
Nobsound
User Manual
Q: All cables are connected, but no sound output?
A: 1. Check if the indicator is on, and turn on the power button or knob if it is not on.
If the indicator is still not on after turn on the power, you can find a laptop power
and connect to test whether it is the machine fault or a power failure.
2. If the indicator is on, check whether the VOL knob is in the minimum position.
If so, turn clockwise to normal volume.
3. If both of the above are normal, check the input device if it is paused, mute,
or the volume is minimized.
Q: Why there is the sound distortion?
A: When the output power exceeds the normal power of amplifier, there will be a large
distortion. you can turn down the preamp volume or the power amplifier volume.
Q: Why do loudspeakers make a lot of electric noise?
A: 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.
Q: Why after connecting signal line, there is interferential sound even not
play music?
A: If you use unshielded signal lines, there will be interference signals entering the
power amplifier. If you hate the noise, please use the shielded signal lines or unplug
the signal lines.
Q: Why does the amplifier stop working after a period of time?After a period
of time off, it will work again.
A: The amplifier may be overheat protected in this case, and the output power may
have exceeded the rated power, so you can turn down the volume and try again.
Q: Why does the volume of the machine stay the same, while the sound of
different audio sources (such as CDS and mobile phones) is different?
A: The output range of different types of audio source devices is different, the mobile
phone is usually 0.35mV, and the CD is 1V.The signal output amplitude of the sound
source will directly influence the volume.
Q: Why the sound of the power amplifier is not very good at the beginning,
the high frequency is not clear, but after working for 8 hours the sound
is normal?
A: Speakers and amplifiers are very sensitive equipment, they also need a process to
know and match each other, after working together for 8 hours the sound will be
good,new power amplifier and new speaker needs more than ten hours.