Introduction
Thank you for purchasing the Nobsound TA-21 PRO 2 Channel Bluetooth Amp Receiver. This high-performance stereo digital amplifier is designed to deliver exceptional audio quality for your wired speakers and home audio system. Featuring a TPA3255 chip and Digital Sound Processing (DSP), it offers powerful and clear sound with versatile connectivity options.
This manual provides detailed instructions for setting up, operating, and maintaining your amplifier to ensure optimal performance and longevity.
Image: Front view of the Nobsound TA-21 PRO amplifier, showcasing its compact black design with a silver front panel, digital display, and control knobs.
Safety Information
- Ensure the power supply voltage matches the requirements specified for the amplifier.
- Do not expose the unit to water, moisture, or extreme temperatures.
- Avoid placing the amplifier in direct sunlight or near heat sources.
- Do not open the casing; there are no user-serviceable parts inside. Refer all servicing to qualified personnel.
- Keep the unit away from strong magnetic fields.
- Disconnect power before cleaning or when not in use for extended periods.
Package Contents
Verify that all items are present in the package:
- 1 x Nobsound TA-21 PRO Digital Amplifier
- 1 x 32V/5A Power Supply
- 1 x User Manual (this document)
Image: Contents of the Nobsound TA-21 PRO package, showing the amplifier unit, power supply, and power cable.
Product Overview
The Nobsound TA-21 PRO features a compact design with intuitive controls and essential connectivity ports.
Front Panel
- O/E Button: Long press for Power On/Off. Short press to select DSP effect.
- Indicator Light: Red for Standby/Working status (chip overload protection). Blue for Bluetooth (flashing: waiting for connection; steady: successful connection). Green for AUX input.
- Volume Display: Digital display showing the current volume level.
- Volume Knob: Rotates to adjust volume.
Rear Panel
- Speaker Output (R/L): Binding posts for connecting passive speakers.
- AUX Input: 3.5mm audio input for wired devices.
- DC 24V-48V IN: Power input port.
Image: Detailed diagram of the Nobsound TA-21 PRO's front and rear panels, labeling all buttons, indicators, display, volume knob, speaker outputs, AUX input, and power input.
Image: Close-up view of the Nobsound TA-21 PRO's front panel, highlighting the digital volume display and the power/DSP button.
Setup
- Connect Speakers: Connect your passive speakers to the speaker output binding posts on the rear panel. Ensure correct polarity (red to red, black to black) for both left (L) and right (R) channels.
- Connect Audio Source:
- AUX Input: Connect your audio device (e.g., TV, computer, CD player) to the 3.5mm AUX input on the rear panel using an audio cable.
- Bluetooth: For wireless connection, ensure no AUX cable is connected. The amplifier will automatically prioritize the AUX input if a cable is detected.
- Connect Power: Connect the provided 32V/5A power supply to the DC 24V-48V IN port on the rear panel, then plug the power supply into a wall outlet.
- Power On: Long press the O/E button on the front panel to power on the amplifier. The indicator light will illuminate.
Image: Illustration showing the Nobsound TA-21 PRO connected to a laptop via AUX and a smartphone via Bluetooth, demonstrating its dual input capabilities.
Operating Instructions
Power On/Off
Long press the O/E button on the front panel to turn the amplifier on or off.
Volume Control
Rotate the VOLUME knob clockwise to increase volume and counter-clockwise to decrease volume. The current volume level will be shown on the digital display.
Video: A demonstration of the Nobsound TA-21 PRO amplifier in use, showing the power button and volume knob being adjusted while connected to speakers.
Input Selection
The amplifier automatically prioritizes the AUX input. If an AUX cable is connected, the amplifier will use the AUX input (Green indicator light). If no AUX cable is connected, the amplifier will switch to Bluetooth mode (Blue indicator light).
Bluetooth Pairing
- Ensure no AUX cable is connected to the amplifier. The blue indicator light will flash, indicating it is in pairing mode.
- On your Bluetooth-enabled device (e.g., smartphone, tablet), search for Bluetooth devices.
- Select "Nobsound TA-21 PRO" (or similar name) from the list of available devices.
- Once paired, the blue indicator light will become steady. You can now play audio wirelessly through the amplifier.
Image: Visual representation of the Nobsound TA-21 PRO's enhanced wireless connection via Bluetooth 5.0 and its built-in DSP effects, shown with a smartphone and speakers.
DSP Effects
Short press the O/E button to cycle through the built-in Digital Sound Processing (DSP) effects. Experiment with different effects to find your preferred sound profile.
Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the amplifier. Do not use liquid cleaners or abrasive chemicals.
- Ventilation: Ensure proper ventilation around the unit. Do not block any ventilation openings.
- Storage: If storing the amplifier for an extended period, disconnect it from power and store it in a cool, dry place.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power cable not connected; Power outlet not working; Amplifier not turned on. | Check power cable connection; Try a different outlet; Long press O/E button to power on. |
| No sound | Incorrect input selected; Volume too low; Speakers not connected properly; Audio source issue. | Ensure correct input (AUX/Bluetooth); Increase volume; Check speaker connections and polarity; Verify audio source is playing. |
| Bluetooth not connecting | AUX cable connected; Amplifier not in pairing mode; Device too far; Previously paired device connected. | Disconnect AUX cable; Ensure blue indicator is flashing; Move device closer; Disconnect from other Bluetooth devices. |
| Sound distortion / Chip overload | Volume too high; Speaker impedance mismatch; Overheating. | Reduce volume; Ensure speakers are 4Ω or 8Ω; Ensure proper ventilation. If red indicator is on, power cycle the unit. |
| Audio delay (AUX input) | Source device processing delay; Amplifier internal processing. | This can sometimes occur with certain source devices. Try adjusting audio settings on the source device (e.g., TV audio output format). |
Specifications
| Feature | Detail |
|---|---|
| Model Number | DZ100 |
| Amplifier Chip | TI TPA3255 |
| Output Power | 300W x 2 (at 4Ω) |
| Distortion | < 0.005% |
| Bluetooth Version | 5.0 |
| Bluetooth Range | Up to 10 meters (33 feet) |
| Audio Inputs | Bluetooth, 3.5mm AUX |
| Working Voltage | DC 24V-48V |
| Product Dimensions | 24 x 5.31 x 0.94 inches (60.96 x 13.49 x 2.39 cm) |
| Item Weight | 2.01 pounds (0.91 kg) |
| Color | Black |
Image: Diagram highlighting the TPA3255 chip, emphasizing its role in providing high-performance amplification with low distortion.
Warranty and Support
Nobsound products are designed for reliability and performance. For warranty information and technical support, please refer to the official Nobsound website or contact your retailer. Keep your purchase receipt as proof of purchase for any warranty claims.
For further assistance, you may visit the Nobsound Store on Amazon.