XY-S350H 2.1 Channel Bluetooth Power Amplifier Board

1. Introduction

The XY-S350H is a high-performance 2.1 channel Bluetooth audio power amplifier board designed for DIY audio enthusiasts and professional applications. It features the TPA3251 chip, delivering powerful output for left/right channels and a dedicated subwoofer. With Bluetooth 5.1 connectivity, AUX input, USB flash disk playback, and USB sound card functionality, it offers versatile audio input options. The board also includes comprehensive protection mechanisms and supports the Sinilink app for advanced control.

2. Safety Information

Please read and understand all safety instructions before operating the device. Failure to follow these instructions may result in electric shock, fire, or other hazards.

• Ensure the power supply voltage and current match the specifications (DC 12-38V / 10A). Using an incorrect power supply can damage the board.
• Do not expose the amplifier board to moisture, water, or extreme temperatures.
• Avoid short-circuiting any terminals.
• Always disconnect power before making any connections or disconnections.
• Keep the device away from children.
• Ensure proper ventilation to prevent overheating.

3. Product Features

• Audio Channels: 2.1 channels (Left, Right, Subwoofer)
• Bluetooth Version: 5.1 for stable wireless audio streaming.
• Multiple Audio Inputs: Bluetooth, AUX (3.5mm), USB Flash Disk, USB Sound Card.
• High Output Power: Up to 220W per channel for L/R, and 350W for subwoofer (at specified impedances and voltage).
• Precise Control: High-end encoder knob for smooth volume adjustment, along with dedicated controls for subwoofer frequency, subwoofer volume, master volume, treble, and channel volume.
• Protection Mechanisms: Built-in overvoltage, undervoltage, clipping, short circuit, and overheating protection.
• Smart App Support: Compatible with Sinilink app for modifying Bluetooth name, setting Bluetooth password, and controlling prompt tones.

4. Specifications

5. Package Contents

The package typically includes:

• 1 x XY-S350H 2.1 Channel Bluetooth Power Amplifier Board

Note: Additional accessories such as power adapters, speakers, or cables may need to be purchased separately.

6. Setup and Installation

Follow these steps to properly set up your XY-S350H amplifier board. Ensure all connections are secure before applying power.

6.1 Power Connection

1. Connect a DC 12-38V / 10A power supply to the `DC+12-38V` and `POWER` terminals. Ensure correct polarity.

6.2 Speaker Connections

1. Left Channel Speaker: Connect the positive (+) terminal of your left speaker to `L+` and the negative (-) terminal to `L-`.
2. Right Channel Speaker: Connect the positive (+) terminal of your right speaker to `R+` and the negative (-) terminal to `R-`.
3. Subwoofer: Connect the positive (+) terminal of your subwoofer to `WOOFER+` and the negative (-) terminal to `WOOFER-`.

6.3 Audio Input Connections

Choose one of the following audio input methods:

• Bluetooth: The default input mode. Pair your device as described in the Operating Instructions.
• AUX Input: Connect an audio source (e.g., smartphone, PC) to the `AUX IN` 3.5mm jack using an audio cable.
• USB Flash Disk: Insert a USB flash drive containing audio files into the `U disk` USB-A port.
• USB Sound Card: Connect the `USB Audio` port to a computer using a USB cable to use the board as an external sound card.

7. Operating Instructions

Once the board is powered on and speakers are connected, you can begin operation.

7.1 Power On/Off

The board powers on automatically when connected to a suitable power supply. There is no dedicated power switch on the board itself. Disconnect the power supply to turn off.

7.2 Bluetooth Pairing

1. Upon powering on, the board will enter Bluetooth pairing mode (indicated by an LED, if present, or an audible prompt).
2. On your mobile device or computer, search for Bluetooth devices and select "XY-S350H" to pair.
3. Once paired, an audible confirmation will be heard, and you can start playing audio.

7.3 Input Mode Selection

The board automatically detects the input source. If multiple sources are connected, it may prioritize Bluetooth or the last active input. Disconnect unused sources if you experience issues.

7.4 Volume and Tone Adjustment

• Master VOL: Adjusts the overall volume level.
• Treble: Adjusts the high-frequency response of the main channels.
• Channel VOL: Adjusts the volume of the left and right main channels.
• Subwoofer VOL: Adjusts the volume level of the subwoofer output.
• Subwoofer FREQ: Adjusts the crossover frequency for the subwoofer, allowing you to control which low frequencies are sent to the subwoofer.

7.5 Sinilink App Functionality

The XY-S350H supports the Sinilink app, which allows for advanced customization:

• Modify the Bluetooth device name.
• Set a Bluetooth connection password.
• Enable or disable prompt tones.

Refer to the Sinilink app documentation for detailed instructions on its use.

8. User Tips

• Power Supply Quality: For optimal performance and to achieve the stated maximum power output, use a high-quality power supply that can consistently deliver the required voltage (12-38V DC) and current (at least 10A). A stable power source is crucial for clear audio and preventing distortion.
• Speaker Matching: Ensure your speakers and subwoofer are rated for the power output of the amplifier board and have appropriate impedance (e.g., 2Ω, 3Ω, 4Ω, 8Ω) to prevent damage and ensure efficient operation.
• Cable Quality: Use good quality, shielded audio cables to minimize interference and noise, especially for AUX input.

9. Troubleshooting

If you encounter issues with your XY-S350H amplifier board, refer to the following common problems and solutions:

9.1 No Sound Output

• Check Power: Ensure the power supply is correctly connected and providing the specified voltage and current.
• Speaker Connections: Verify that all speaker wires are securely connected to the correct terminals and that polarity is observed.
• Volume Levels: Turn up the Master VOL, Channel VOL, and Subwoofer VOL knobs.
• Audio Source: Confirm that your audio source is playing and its volume is turned up.
• Input Mode: Ensure the correct input mode is active (e.g., Bluetooth paired, AUX cable fully inserted).

9.2 Distorted Sound

• Volume Too High: Reduce the Master VOL or the volume on your audio source.
• Power Supply: An insufficient or unstable power supply can cause distortion at higher volumes. Ensure your power supply meets the 10A requirement.
• Speaker Impedance: Verify that your speakers' impedance matches the amplifier's capabilities.
• Cable Quality: Replace low-quality or damaged audio cables.

9.3 Bluetooth Connection Issues

• Pairing Mode: Ensure the amplifier board is in pairing mode.
• Device Visibility: Make sure Bluetooth is enabled on your source device and it's discoverable.
• Distance: Keep the source device within the effective range of the amplifier.
• Interference: Move away from other wireless devices that might cause interference.
• Forget Device: On your source device, 'forget' the XY-S350H and try pairing again.

10. Maintenance

Proper maintenance ensures the longevity and optimal performance of your amplifier board.

• Cleaning: Use a soft, dry cloth to clean the surface of the board. Do not use liquid cleaners or solvents.
• Dust: Periodically remove dust accumulation from the board, especially around heat sinks and ventilation areas, using compressed air or a soft brush.
• Storage: When not in use for extended periods, store the board in a cool, dry place, away from direct sunlight and extreme temperatures.
• Connections: Regularly check all wiring connections to ensure they are tight and free from corrosion.

11. Warranty and Support

For warranty information or technical support, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.