Nobsound TA-21 - User Manual

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
WARM TIPS
Douk Audio TA-21 Mini
Bluetooth 5.0 Digital Amplifier
Nobsound
User Manual

Summary

How to Use the Nobsound TA-21 Amplifier

Wireless Bluetooth Connection

Connect your audio source via Bluetooth, turn on the amplifier, and pair the devices for wireless audio playback.

Wired AUX Connection

Connect your audio source using an AUX cable and passive speakers for wired audio input.

Basic Operation and Controls

Learn how to turn on the amplifier and adjust volume, play, or pause music using its buttons.

Important Usage Tips

Power Connection Safety

Connect the power supply to the amplifier first, then to the socket to prevent sparks.

Power Supply Recommendations

Understand the default power supply capabilities and when to use a higher output supply for demanding speakers.

Input Mode Switching

Learn how the indicator light changes color for AUX and Bluetooth modes and how to switch inputs.

Frequently Asked Questions

Troubleshooting No Sound Output

Check indicator status, volume knob position, and input device settings if no sound is produced.

Resolving Sound Distortion and Noise

Address distortion by reducing volume and noise by using shielded cables or proper power supplies.

Amplifier Operation and Performance Issues

Understand amplifier auto-shutdown due to overheat and the 'burn-in' period for optimal sound quality.

Front and Rear Panel Details

Controls and Indicators

Identify and understand the function of the volume display, power button, volume controls, and input indicator.

Input and Output Connections

Locate the AUX input, speaker output terminals (Left/Right channels), and the DC power input port.

Power Supply Requirements

Details on the required power input voltage range and minimum power supply wattage for operation.

Product Specifications

Technical Parameters

Key specifications including audio inputs, output power, chip, speaker compatibility, frequency response, and dimensions.

Contact Information

Details for customer support, including address, contact person, telephone number, and email.

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features and Troubleshooting

The Nobsound Douk Audio TA-21 Mini Bluetooth 5.0 Digital Amplifier is a compact and versatile audio device designed to power passive speakers, offering both wireless Bluetooth and wired AUX input options. Its primary function is to amplify audio signals for an enhanced listening experience, making it suitable for various home audio setups.

Function Description:

The TA-21 Mini serves as a stereo power amplifier, capable of driving a range of passive speakers. It features a Bluetooth 5.0 module for wireless audio streaming from compatible devices, as well as a 3.5mm AUX input for connecting wired audio sources. The amplifier is designed for ease of use, with simple controls for power, volume adjustment, and play/pause functionality. An LED display indicates the current volume level, and an input indicator light (blue for Bluetooth, green for AUX) clearly shows the active input mode. The device prioritizes user safety by recommending connecting the power supply to the amplifier first before plugging it into the wall socket, though it notes that minor sparks during connection are normal and safe.

Important Technical Specifications:

• 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 Impedance: 3"-10" / 4-8Ω
• Frequency Response: 80Hz-20KHz
• Working Voltage: DC 9V-24V / 3A or above
• Minimum Input Power: 50W
• Dimensions (WDH): 907823mm / 3.543.070.91in
• Net Weight: 143g / 0.32lb
• Package Weight: 600g / 1.32lb
• Default Power Supply: 12V/5A (Max Output 60W), user-upgradable to DC 9-24V for higher power speakers.

Usage Features:

The amplifier offers straightforward operation:

1. Power Connection: Always connect the power supply to the amplifier first, then to the wall socket.
2. Wireless Input (Bluetooth Mode):
   • Connect passive speakers to the amplifier's output using high-quality cables.
   • Long press the power button for 2 seconds to turn on the device. The indicator will flash blue, signifying Bluetooth mode.
   • Enable Bluetooth on your audio source device, search for "TA-21," and connect. The blue indicator will become solid once connected.
3. Wired Input (AUX Mode):
   • Connect your audio source to the amplifier's 3.5mm AUX input using a high-quality AUX cable.
   • Connect passive speakers to the amplifier's output.
   • Long press the power button for 2 seconds to turn on the device. The indicator will be solid green, indicating AUX mode.
   • Note: If an AUX cable is plugged in, the amplifier will automatically switch to AUX input (green indicator). To use Bluetooth, unplug the AUX cable.
4. Volume and Playback Control: Use the dedicated buttons to adjust volume, play, or pause music. The volume LED display shows the current level.
5. Power Supply Flexibility: While it comes with a 12V/5A power supply (60W max output), users can upgrade to a DC 9-24V power supply for speakers requiring higher power. The amplifier requires a minimum of 50W power supply. If the amplifier auto-powers off during use, it suggests that the speakers require a higher power supply, and users should either turn down the volume or use a more powerful supply.

Maintenance Features and Troubleshooting:

The manual provides a comprehensive FAQ section to address common issues:

• No Sound Output:
  • Check if the indicator is on and if the power button/knob is engaged. If the indicator is off, test with a laptop power supply to rule out machine fault or power failure.
  • If the indicator is on, ensure the VOL knob is not at its minimum position.
  • Verify that the input device is not paused, muted, or has its volume minimized.
• Sound Distortion: Occurs when output power exceeds the amplifier's normal capacity. Reduce the preamp or power amplifier volume.
• Electric Noise (Loudspeakers): Often caused by non-original or low-quality power supplies with high interference coefficients. Replace with the original factory standard power supply or a high-quality alternative.
• Interferential Sound (with signal line connected, no music playing): Use shielded signal lines to prevent interference signals from entering the amplifier. Alternatively, unplug the signal lines when not in use.
• Amplifier Stops Working (Overheat Protection): If the amplifier stops working and then resumes after a period, it's likely due to overheat protection, indicating the output power exceeded the rated power. Reduce the volume and retry.
• Volume Differences with Various Audio Sources: Different audio source devices have varying output ranges (e.g., mobile phones typically 0.35mV, CDs 1V). The signal output amplitude directly affects the perceived volume.
• Initial Sound Quality (Not Optimal): Speakers and amplifiers require a "break-in" period to match and perform optimally. The manual suggests that after approximately 8 hours of use, the sound quality, particularly high frequencies, will improve. New power amplifiers and speakers may need over ten hours for optimal performance.

The Nobsound TA-21 Mini is designed to be a reliable and user-friendly solution for amplifying audio, with features that cater to both casual listeners and those seeking to optimize their home audio experience.

Nobsound TA-21 Specifications

General

Brand	Nobsound
Model	TA-21
Category	Amplifier
Language	English