Introduction
The Wuzhi Audio ZK-TB21 is a high-power 2.1-channel digital power amplifier module designed for audio enthusiasts. It features Bluetooth connectivity, an AUX input, and independent control over subwoofer frequency and volume, as well as treble and bass for the main stereo channels. This manual provides essential information for the safe and effective use of your amplifier module.
Figure 1: Wuzhi Audio ZK-TB21 Amplifier Module Overview
Setup
Before connecting the module, ensure all power sources are disconnected. Incorrect wiring can damage the device.
Connection Diagram
Figure 2: Connection Points and Controls
Wiring Instructions
- Power Input (DC12-24V): Connect a DC power supply within the 12V to 24V range to the terminal labeled 'DC12-24V'. Ensure correct polarity (+ and -).
- Speaker Output (L+, L-, R+, R-): Connect your left and right passive speakers to the terminals labeled 'L+' 'L-' and 'R+' 'R-' respectively. Observe correct polarity.
- Subwoofer Output (S+, S-): Connect your passive subwoofer to the terminals labeled 'S+' 'S-'. Observe correct polarity.
- Audio Input:
- Bluetooth (BT): The module will automatically enter Bluetooth pairing mode when powered on. Search for 'ZK-TB21' on your device and connect.
- AUX-IN: Connect an audio source (e.g., smartphone, MP3 player) to the 3.5mm AUX-IN jack.
Operating Instructions
- Power On/Off: Rotate the 'MAIN VOLUME' knob clockwise to turn the module ON. Rotate counter-clockwise until it clicks to turn OFF.
- Volume Control: Adjust the overall output volume using the 'MAIN VOLUME' knob.
- Subwoofer Control:
- SUBWOOFER FREQ: Adjusts the cutoff frequency for the subwoofer output.
- SUBWOOFER VOLUME: Controls the volume level of the subwoofer.
- R&L Channel Tone Control:
- TREBLE: Adjusts the high-frequency response for the left and right channels.
- BASS: Adjusts the low-frequency response for the left and right channels.
- Input Selection: The module automatically prioritizes AUX-IN when a cable is connected. Disconnect the AUX cable to switch to Bluetooth mode.
Maintenance
- Keep the module clean and free from dust. Use a soft, dry cloth for cleaning.
- Avoid exposing the module to moisture, extreme temperatures, or direct sunlight.
- Ensure adequate ventilation around the module to prevent overheating, especially during prolonged use at high volumes.
- Do not attempt to disassemble or modify the module, as this will void any potential warranty and could lead to damage or injury.
Troubleshooting
- No Power: Check the DC power supply connection and ensure it is within the 12-24V range. Verify correct polarity.
- No Sound:
- Ensure the 'MAIN VOLUME' knob is turned up.
- Check all speaker and audio input connections for proper seating and polarity.
- If using Bluetooth, ensure the module is paired and the source device's volume is up.
- If using AUX-IN, ensure the cable is fully inserted and the source device is playing audio.
- Distorted Sound:
- Reduce the 'MAIN VOLUME' or the volume on your audio source.
- Check speaker impedance compatibility with the amplifier.
- Ensure the power supply is stable and sufficient.
- Bluetooth Disconnection: Ensure your Bluetooth device is within range and there are no significant obstructions. Try re-pairing the device.
Specifications
Figure 3: Module Dimensions
| Feature | Detail |
|---|---|
| Model | ZK-TB21 |
| Brand | Wuzhi Audio |
| Type | Digital Power Amplifier Module |
| Channels | 2.1 (Left, Right, Subwoofer) |
| Power Output | 50W x 2 (Stereo) + 100W (Subwoofer) |
| Input Voltage | DC 12-24V |
| Audio Inputs | Bluetooth, AUX-IN (3.5mm) |
| Controls | Main Volume, Subwoofer Frequency, Subwoofer Volume, R&L Channel Treble, R&L Channel Bass |
| Dimensions (L x W) | 100mm x 102mm |
| Origin | Mainland China |
User Tips
- Power Supply Quality: For optimal performance and to avoid distortion, use a high-quality power supply that can deliver sufficient current for the amplifier's power output. A 24V power supply is generally recommended for achieving the full rated power.
- Speaker Matching: Ensure your speakers and subwoofer are rated to handle the amplifier's output power to prevent damage.
- Cable Quality: Using shielded audio cables can help reduce interference and improve sound quality.
Warranty and Support
For warranty claims, technical support, or further assistance, please contact the seller or retailer from whom you purchased the Wuzhi Audio ZK-TB21 module. Keep your proof of purchase for any warranty-related inquiries.
