Manuals+

Gaqqee ZK-3002 2G

ZK-3002 2G TPA3255 Power Amplifier Board

User Instruction Manual

Brand: Gaqqee | Model: ZK-3002 2G

1. Introduction

Thank you for choosing the ZK-3002 2G TPA3255 Power Amplifier Board. This high-performance audio module is designed to deliver pure sound quality and stable power output for various audio applications. Featuring an original imported TPA3255 chip, intelligent cooling, and anti-POP sound technology, it ensures an enhanced auditory experience. This manual provides detailed instructions for setup, operation, and maintenance to help you get the most out of your amplifier board.

ZK-3002 2G TPA3255 Power Amplifier Board
Figure 1: ZK-3002 2G TPA3255 Power Amplifier Board

2. Key Features

  • High-Fidelity Audio: Adopts the original imported TPA3255 chip for pure sound quality and stable, high-power output.
  • Intelligent Cooling: Equipped with a temperature-controlled fan for intelligent heat dissipation, ensuring long-term stable operation.
  • Anti-POP Sound Technology: Supports MCU intelligent anti-POP sound technology, eliminating noise during power-on and power-off.
  • Optimized Sound Quality: Features a digital amplifier-specific high-current inductor with low magnetic loss and anti-interference properties.
  • Versatile Bridging Modes: Supports BTL (Bridge-Tied Load) dual-channel and PBTL (Parallel Bridge-Tied Load) mono bridging mode switching to adapt to various speaker configurations.
  • Volume Control: Analog potentiometer with stepless adjustment and an integrated mechanical switch.
  • Robust Protection: Includes input undervoltage, overheating, overcurrent, and short-circuit protection mechanisms.
Key Features of the Audio Amplifier Board
Figure 2: Visual representation of key features including One-Touch Bridge Mode, Temperature-Controlled Fan, MCU Intelligent Anti-POP Protection, Stepless Adjustment with Switch, Cascade Anti-POP Control Interface, and Genuine Imported TPA3255.

3. Specifications

Parameter Value
Product Name 300W Dual Channel / 600W Single Channel Pure Rear Stage Amplifier Board
Amplifier Chip Original TPA3255
Product Model ZK-3002 2G
Supply Voltage DC 18-50V (Max 53V). Recommended: 36-48V DC, 10A or above.
Compatible Speakers (BTL Dual Channel) 3-8 ohms, 50-300W
Compatible Speakers (PBTL Mono Mode) 2-8 ohms, 100-600W
Cooling Method Temperature-controlled automatic air cooling or manual continuous fan operation
Volume Adjustment Analog potentiometer with stepless adjustment and mechanical switch
Maximum Power (BTL Mode) 2*300W@50V 4Ω, 160W@50V 8Ω
Maximum Power (PBTL Mode) 600W@50V 2Ω, 300W@50V 4Ω, 160W@50V 8Ω
Protection Mechanisms Input undervoltage, overheating, overcurrent, short circuit protection. (No input anti-reverse polarity protection)
Product Size 145mm x 65mm x 37mm (5.71in x 2.56in x 1.46in)
Operating Temperature 0-50°C
Product Specifications Overview
Figure 3: Detailed product specifications including power output, voltage, and speaker compatibility.
Product Dimensions
Figure 4: Dimensions of the amplifier board: 145mm/5.71in (length), 65mm/2.56in (width), 36.8mm/1.44in (height).

4. Package Contents

The package includes the following items:

  • 1x ZK-3002 2G TPA3255 Power Amplifier Board
  • 1x Accessory Kit (typically includes necessary cables for audio input and power connection)
Amplifier Board with Included Accessory Kit
Figure 5: The ZK-3002 2G amplifier board shown with the included accessory cables.

5. Safety Precautions

  • Always disconnect power before making any connections or adjustments to the amplifier board.
  • Ensure the power supply voltage is within the specified range (DC 18-50V). Exceeding 53V can damage the board.
  • Do not reverse the positive and negative poles of the power input. The board does not have anti-reverse polarity protection.
  • Avoid short-circuiting output terminals.
  • Keep the board away from moisture, dust, and extreme temperatures.
  • Ensure proper ventilation to prevent overheating, especially during high-power operation.
  • If you are unsure about any connection, consult a qualified technician.

6. Setup Instructions

6.1 Component Identification

Amplifier Board Component Layout and Connections
Figure 6: Layout of the amplifier board showing DC 18-50V Power Input, Left Channel Output, Right Channel Output, Dip Switch Selection, Cascade Protection POP Control Interface, Dip switch, Continuously adjustable volume with switch, and XH2.54-3P audio input terminal.

6.2 Power Connection

  1. Connect your DC 18-50V power supply to the designated power input terminals on the board. Ensure correct polarity (positive to +, negative to -).
  2. It is recommended to use a 36-48V DC power supply with a current of 10A or above for optimal performance.

6.3 Audio Input Connection

  1. Connect your audio source (e.g., smartphone, PC, preamplifier) to the XH2.54-3P audio input terminal.
  2. The left channel audio input is default in PBTL mode.

6.4 Speaker Connection (Dual Channel BTL Mode)

  1. For dual-channel stereo output, connect your left speaker to the Left Channel Output terminals and your right speaker to the Right Channel Output terminals.
  2. Ensure speaker impedance is between 3-8 ohms and power handling is 50-300W per channel.

6.5 Speaker Connection (Mono PBTL Bridging Mode)

To enable PBTL (mono) bridging mode:

  1. Disconnect power before performing bridging operations.
  2. Locate the DIP switch on the board.
  3. Set DIP switch 1 to the ON position to enable PBTL.
  4. For parallel output, short circuit the R+ and L+ output terminals together.
  5. For parallel output, short circuit the R- and L- output terminals together.
  6. Connect your single speaker to the combined R+/L+ and R-/L- terminals.
  7. Ensure speaker impedance is between 2-8 ohms and power handling is 100-600W.
Bridging Function Wiring Diagram
Figure 7: Diagram illustrating the bridging function. Set DIP switch 1 to ON for PBTL. Connect 2-speaker output in parallel: R+L+ grounded together, R-L- grounded together. Disconnect power before bridging.

6.6 Cascade Protection POP Control Interface

This interface allows connection to 2.1-channel amplifier boards equipped with this control interface, such as AS21 Gen 2, SUIB600, etc., for synchronized anti-POP control.

7. Operating Instructions

  1. After all connections are securely made, turn on the power supply.
  2. The amplifier board features MCU intelligent anti-POP sound technology, so you should not hear any popping noise during power-on.
  3. Adjust the volume using the analog potentiometer. This potentiometer also acts as a mechanical switch; turn it fully counter-clockwise to switch off the amplifier.
  4. Ensure the audio source is playing and adjust the volume to your desired level.
  5. The intelligent cooling system will automatically activate the fan when the board reaches a certain temperature. You can also manually select continuous fan operation if desired.

8. Maintenance

  • Cleaning: Use a soft, dry cloth to clean the surface of the amplifier board. Do not use liquid cleaners or solvents.
  • Ventilation: Ensure that the fan and heatsink are free from dust and obstructions to maintain optimal cooling performance. Periodically clean any dust accumulation with compressed air.
  • Storage: When not in use for extended periods, store the amplifier board in a dry, cool place, away from direct sunlight and extreme temperatures.

9. Troubleshooting

Problem Possible Cause Solution
No sound output
  • No power or incorrect power connection.
  • Audio input cable loose or incorrect.
  • Speaker cables loose or incorrect.
  • Volume knob turned down or off.
  • Protection mechanism activated.
  • Check power supply and polarity.
  • Verify audio input cable connection.
  • Check speaker wiring and ensure correct impedance.
  • Turn up the volume knob.
  • Power cycle the device; check for overheating or short circuits.
Distorted sound
  • Input signal too high.
  • Speaker impedance mismatch.
  • Power supply insufficient.
  • Reduce audio input volume.
  • Ensure speakers match specified impedance.
  • Use a power supply with adequate voltage and current (e.g., 48V 10A).
Amplifier board gets hot
  • Operating at high power for extended periods.
  • Insufficient ventilation.
  • Fan not operating.
  • Ensure adequate airflow around the board.
  • Check if the fan is spinning. If not, inspect connections or consider manual fan operation.
  • Reduce output power if consistently overheating.
Popping noise on power-up/down
  • MCU anti-POP function not working as expected.
  • External interference.
  • Ensure proper grounding of audio source and amplifier.
  • Check for loose connections.
  • If using cascade protection, ensure the interface is correctly connected.

10. User Tips

  • For best sound quality, use a high-quality, stable power supply that meets or exceeds the recommended current.
  • Consider using shielded audio cables to minimize interference and noise.
  • When experimenting with different speaker configurations, always double-check wiring and impedance to prevent damage.
  • Mount the amplifier board in an enclosure that allows for good airflow to the heatsink and fan.
  • If using the PBTL mono mode, ensure your single speaker can handle the increased power output.

11. Warranty and Support

This product is covered by the standard manufacturer's warranty. For technical support, troubleshooting assistance, or warranty claims, please contact the seller or manufacturer directly through your purchase platform. Please have your product model (ZK-3002 2G) and purchase details ready when contacting support.