XY-AS21HPA Bluetooth 5.2 Digital Sound Amplifier Board 2.1 Channel User Manual

1. Product Overview

The XY-AS21HPA is a high-performance Bluetooth 5.2 HiFi digital power amplifier board, delivering powerful 300W*2+600W output for 2.1 channel audio. It features dual TPA3255 chips for enhanced stability and high-definition sound quality with low distortion. This amplifier board supports multiple audio inputs including Bluetooth, AUX, and USB Audio, and offers convenient app control. Its compact design makes it suitable for various DIY audio projects, speaker upgrades, and custom audio systems.

2. Key Features

• Dual TPA3255 Chip Design: Utilizes two original imported TPA3255 amplifier chips for greater stability and high-performance D-class amplification, delivering true high-end sound quality.
• High Power Output: Provides 300W+300W for left/right channels and 600W for the subwoofer, suitable for demanding audio setups.
• Bluetooth 5.2 Connectivity: Offers stable, low-latency wireless streaming from smartphones, tablets, and laptops with AAC SBC decoding.
• Multiple Audio Inputs: Supports Bluetooth, AUX (3.5mm), USB flash drive, and USB sound card input for versatile connectivity.
• HiFi Sound Quality: Features advanced integrated feedback design and proprietary high-speed gate driver error correction (PurePath HD) for ultra-low distortion across the entire audio frequency band.
• Independent Tone Control: Easy-to-use front-panel knobs allow independent tuning of subwoofer frequency, subwoofer volume, bass, treble, and left/right channel volume.
• Comprehensive Protection: Includes reverse power protection for safer operation.
• Digital Amplifier Specific Inductors: Uses low-loss inductors for improved efficiency.
• App Control: Dedicated mobile app (Sinilink APP) for convenient operation, including volume adjustment, input selection, EQ settings, and Bluetooth name/password management.
• Compact Design: Small form factor for easy integration into custom audio setups.

3. Specifications

4. Setup & Connection

4.1. Power Connection

• Connect a DC 19-51V power supply (10A or above recommended) to the DC 19-51V input terminals (5.5-2.5mm DC socket).
• Ensure the polarity is correct (positive to positive, negative to negative) to avoid damage.
• Use a stable power supply to avoid noise and damage to the board.

4.2. Speaker Connection

• Connect the left and right speaker terminals to your speakers. Observe polarity markings to ensure correct phasing.
• Ensure the speaker impedance is compatible with the amplifier board (typically 4-8Ω).
• Connect the subwoofer speaker to the dedicated subwoofer output terminals.

4.3. Audio Inputs

• USB Audio: Connect the USB port to a computer. The board will be recognized as a USB sound card.
• AUX IN: Use a 3.5mm audio cable to connect external audio sources (phone, CD player, etc.).
• Bluetooth: Enable Bluetooth pairing mode on your device and connect to the amplifier board for wireless streaming.
• USB Flash Drive: Insert a USB flash drive containing WAV, FLAC, APE, or MP3 audio files into the USB port.

5. Operation Instructions

5.1. Basic Operation

1. Connect the power supply, speakers, and audio inputs as described in the Setup section.
2. Turn on the power supply. The board will initialize and enter standby mode.
3. Select your desired input source (USB, AUX, or Bluetooth) using the app or control buttons.
4. Adjust the volume using the front-panel knobs or the mobile app.
5. Play audio from your source device; the board will amplify the signal and output to the speakers.
6. When finished, turn off the power supply first, then disconnect all connections.

5.2. Multi-function Volume Knob

6. App Control

• Download the dedicated mobile app (Sinilink APP) from the official website or app store.
• Connect the app to the amplifier board via Bluetooth.
• Use the app to adjust volume, switch inputs, manage Bluetooth name and pairing password, enable/disable prompt tones, switch EQ, and manage USB drive playlists.

7. Safety & Maintenance

1. Power Safety: Use only a DC 19-51V power supply. Do not exceed the recommended voltage.
2. Heat Management: Ensure the board is installed in a well-ventilated area to prevent overheating.
3. Connection Safety: Double-check all connections before powering on to avoid short circuits.
4. Cleaning: Use a dry, soft cloth to wipe the board. Do not use liquid cleaners or aerosols directly on the unit.

8. Troubleshooting

If you notice unusual noise, no output, or connectivity issues, check all connections and restart the board. Contact technical support if problems persist.

9. User Tips

• For optimal sound quality, ensure your power supply can deliver sufficient current (10A or above) at the recommended voltage.
• Experiment with the subwoofer frequency and volume controls to find the best balance for your specific speakers and room acoustics.
• When using the app, ensure your phone's Bluetooth is enabled and the app has necessary permissions to connect to the amplifier.
• Consider using an external 2.4GHz antenna for improved Bluetooth range and stability, especially if the amplifier is enclosed.

10. Package Contents

The package typically includes the following, though contents may vary slightly based on the version purchased (Full Board, External Board, or Bare Board):

• XY-AS21HPA Digital Power Amplifier Board ×1 (needs to be assembled)
• User manual ×1
• Screwdriver ×1
• Audio cable (20cm, for External Potentiometer Version)
• Warranty card ×1

Please note: Products are shipped unassembled, and accessories are shipped separately for self-assembly.

11. Warranty & Support

This product is covered by a manufacturer's warranty against defects in materials and workmanship for a period of 12 months from the date of purchase. For warranty claims, please contact the official customer service center with your purchase receipt and product details.

For additional guides and documents, you may refer to the User Manual (PDF).