1. Product Overview
The ZK-SUB1200Q is a high-performance Bluetooth amplifier board designed for stereo audio applications with subwoofer and microphone expansion capabilities. Featuring dual original TPA3255 chips, it delivers high power output and supports APTX-HD lossless decoding for superior sound quality. The board is equipped with an NE5532 operational amplifier for low noise and excellent audio detail.
Key Features:
- Dual original TPA3255 chips for high power output (600W x 2).
- Supports APTX-HD lossless decoding and 24-bit DAC for high-fidelity audio.
- Equipped with NE5532 operational amplifier for low noise and detailed sound.
- Subwoofer expansion with frequency and volume adjustment, compatible with 2.1 channel systems.
- Karaoke board expansion interface for microphone integration.
- Optimized heat dissipation with a brushed heat sink and silent fan.
2. Setup Instructions
2.1 Power Supply Connection
The ZK-SUB1200Q requires a DC power supply with an operating voltage range of 18-50VDC. The maximum permissible voltage is 53V. For optimal performance, it is recommended to use a DC power supply with a voltage of 36-48V and a current of 10A or above.
- Connect the power supply to the 'Power input 18-50VDC' port. This can be a 5.5-2.5DC female socket or a 2P terminal block.
- Ensure correct polarity: positive and negative poles cannot be reversed.
2.2 Audio Input and Speaker Connections
- Speakers: Connect your left and right channel speakers to the designated speaker output terminals.
- LINE IN Input: For wired audio input, connect your source (e.g., CD player, phone) to the 'LINE IN input' (3.5mm audio jack).
- Bluetooth Input: The amplifier supports Bluetooth audio input (SBC/AAC/APTX/APTX-HD formats). Refer to Section 3.1 for Bluetooth pairing.
2.3 Subwoofer Expansion
The ZK-SUB1200Q supports subwoofer expansion for a 2.1 channel system. This requires connecting a pure post amplifier board with a controlled interface.
- Connect the 'Subwoofer signal output expansion interface' to your subwoofer amplifier board.
- Utilize the 'Joint defense POP control interface' to ensure that there is no POP sound when the cascading power is turned off. The pure back-end board must have a controlled interface for this feature to work.
2.4 Microphone Front-End Board (ZK-AMP) Installation
The amplifier board includes an expansion interface for connecting a ZK-AMP microphone front-end board, enabling karaoke functionality.
- Ensure the main amplifier board is powered by 18-50VDC.
- The ZK-AMP microphone board requires its own power supply of 8-26VDC.
- When using the expansion interface, the dial switch on the amplifier board must be turned to the OFF position.
- Connect 'Expansion port 1' to the microphone front stage board reverb input.
- Connect 'Expansion port 2' to the microphone front stage board reverb output.
2.5 External Antenna Installation (Optional)
The board is equipped with onboard antennas for a normal Bluetooth range of 10-15 meters. If the amplifier is installed in a metal enclosure (which can block the signal) or if a longer Bluetooth distance (20-30 meters) is desired, external antennas should be used.
- Purchase a 2.4G antenna, including an antenna extension cable and antenna rod.
- Connect the external antenna to the IPEX/IPX generation antenna base, which is already soldered onto the amplifier board.
3. Operating Instructions
3.1 Bluetooth Pairing
- Ensure the amplifier board is powered on.
- On your audio source device (e.g., smartphone, tablet), enable Bluetooth and search for available devices.
- Select 'ZK-SUB1200Q' (or similar name) from the list to pair.
- Once paired, audio will be streamed wirelessly to the amplifier.
3.2 Controls
The amplifier board features several knobs for audio adjustment:
- Master Volume with Switch: Rotate this knob clockwise to increase volume. Rotate counter-clockwise to the end to turn off the amplifier.
- Bass Adjustment: Adjusts the overall bass level.
- Bass Signal Frequency Adjustment (20-200Hz): Fine-tunes the cutoff frequency for the bass signal, particularly useful with subwoofer expansion.
- Bass Signal Volume Adjustment: Controls the volume level of the bass signal.
- Treble Adjustment: Adjusts the treble level for high frequencies.
3.3 Optional Button Extension Wiring
For remote control or integrated system control, external buttons can be wired to the board.
- PLAY/PAUSE: Short press to play/pause. Long press for 3 seconds to disconnect Bluetooth.
- PREV/VOL-: Short press for previous track. Long press for volume down.
- NEXT/VOL+: Short press for next track. Long press for volume up.
4. Maintenance
- Heat Dissipation: The amplifier features a brushed heat sink and a silent fan for optimal heat dissipation. Ensure the fan and heat sink fins are kept clear of dust and obstructions to maintain proper airflow.
- Cleaning: Use a soft, dry cloth to clean the amplifier board. Avoid using liquids or abrasive cleaners.
- Storage: When not in use for extended periods, store the amplifier in a dry, dust-free environment.
5. Troubleshooting
- No Power:
- Check if the power supply is correctly connected and within the 18-50VDC range.
- Ensure the power supply is providing sufficient current (10A or above recommended for 36-48V).
- Verify that the master volume knob is not turned completely off.
- No Sound Output:
- Check all speaker connections for proper wiring and polarity.
- Verify the audio input source (Bluetooth or LINE IN) is active and sending a signal.
- Adjust the master volume and individual tone controls (bass, treble).
- Bluetooth Connection Issues:
- Ensure the amplifier is within the effective range of your Bluetooth device (10-15m, or 20-30m with external antenna).
- Check for obstructions, especially metal enclosures, that might interfere with the signal.
- Try disconnecting and re-pairing the Bluetooth device.
- If using an external antenna, ensure it is correctly installed.
- POP Sound During Power On/Off (with Subwoofer Expansion):
- Ensure the subwoofer amplifier board has a controlled interface and is properly connected to the 'Joint defense POP control interface' on the ZK-SUB1200Q. This feature is designed to prevent POP sounds.
- Protection Mechanism Activated:
- The amplifier has built-in protection against input undervoltage, overheating, overcurrent, and short circuits. If the amplifier stops functioning, check for these conditions.
- Immediately disconnect power if a short circuit is suspected.
- Allow the unit to cool down if overheating is detected.
6. Specifications
| Parameter | Description |
|---|---|
| Product Name | Qualcomm APTX Edition BT Amplifier Board with subwoofer extension |
| Product Model | ZK-SUB1200Q |
| Adapted Power Supply | Operating voltage range of 18-50VDC, maximum voltage of 53V. Recommended: 36-48VDC, 10A or above. |
| Maximum Power | Single channel 600W@50V, 2Ω; 300W@50V, 4Ω (Higher voltage, smaller resistance, greater output power) |
| BT Encoding Format | SBC/AAC/APTX/APTX-HD |
| Input Method | BT+AUX |
| Number of Channels | 2.0+channels |
| Amplifier Chip | Two original TPA3255 chips |
| Protection Mechanism | Input undervoltage, overheating, overcurrent, short circuit protection. No input anti reverse protection, positive and negative poles cannot be reversed! |
| Product Size (Integrated) | 151x120x37mm |
| Product Size (Lead Type) | 132x120x37mm |
| Package Type | SMD |
| Application | Speaker |
| Origin | Mainland China |
| Condition | New |
| High-concerned chemical | None |
Product Packaging:
7. User Tips
- App Compatibility: This amplifier board operates independently and does not require a specific mobile application for its core functions (Bluetooth, AUX input, volume/tone control).
- Power Supply Quality: Using a stable and high-quality DC power supply within the recommended voltage and current range is crucial for achieving the best audio performance and ensuring the longevity of the amplifier.
- Enclosure Design: When integrating the board into an enclosure, consider proper ventilation to aid the built-in fan in heat dissipation. For metal enclosures, an external Bluetooth antenna is highly recommended to avoid signal degradation.
8. Warranty and Support
For warranty information, technical support, or any inquiries regarding your ZK-SUB1200Q Bluetooth Amplifier, please contact the seller or manufacturer directly through your purchase platform. Keep your purchase records for reference.
⚠ WARNING: California Proposition 65
This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
