YS-S350H 2.1 Channel Bluetooth Amplifier Board User Manual

1. Product Overview

The YS-S350H is a high-power 2.1 channel Bluetooth audio amplifier board designed for enthusiasts and DIY audio projects. It features Bluetooth 5.1 connectivity, AUX input, USB flash drive playback, and USB sound card functionality. With independent adjustment for left/right channels and subwoofer, it delivers a powerful and customizable audio experience.

2. Safety Information

• Ensure the power supply meets the specified voltage and current requirements (DC18-38V/10A or above). Using an incorrect power supply can damage the device and pose a fire hazard.
• Do not expose the amplifier board to moisture or extreme temperatures.
• Avoid touching the circuit board components while the device is powered on.
• Ensure proper ventilation to prevent overheating.
• Always disconnect power before making any connections or disconnections.

3. Setup Instructions

3.1 Component Identification

3.2 Power Connection

1. Connect a DC power supply (18-38V, 10A or above) to the 'POWER DC18-38V' input terminal on the board. Ensure correct polarity (+ and -).

3.3 Speaker Connection

1. Connect your left and right channel speakers to the 'L OUT' and 'R OUT' terminals respectively. Ensure speaker impedance is within the recommended range (2Ω-8Ω).
2. Connect your subwoofer to the 'SUB OUT' terminal. Ensure subwoofer impedance is within the recommended range (2Ω-8Ω).

3.4 Audio Input Connection

The YS-S350H supports multiple audio input methods:

• Bluetooth 5.1: This is the primary wireless input.
• AUX Input: Connect an external audio source (e.g., smartphone, MP3 player) using a 3.5mm audio cable to the 'AUX IN' port.
• USB Flash Drive: Insert a USB flash drive containing audio files into the 'USB' port.
• USB Sound Card: Connect the board to a computer via the 'USB' port to use it as an external sound card.

4. Operating Instructions

4.1 Powering On/Off

1. After all connections are secure, connect the power supply to a wall outlet. The board will power on automatically.
2. To power off, disconnect the power supply from the wall outlet.

4.2 Bluetooth Pairing

1. Ensure the amplifier board is powered on.
2. On your mobile device, enable Bluetooth and search for available devices.
3. Select 'YS-S350H' (or its customized name) from the list to pair. A confirmation sound may be heard.

4.3 Audio Input Selection

The amplifier automatically detects the active input. If multiple inputs are connected, you may need to pause playback on one source to switch to another, or use the YS Audio-APP for explicit selection.

4.4 Adjusting Audio

Use the encoder knobs on the front panel for precise audio adjustments:

• VOL: Master Volume control.
• BASS: Adjusts the bass level for the main channels.
• TREBLE: Adjusts the treble level for the main channels.
• SUB VOL: Adjusts the subwoofer volume independently.
• FREQ: Adjusts the subwoofer cutoff frequency (360-degree infinite tuning).

4.5 YS Audio-APP Control

The YS-S350H supports control via the YS Audio-APP, offering enhanced features:

• Change Bluetooth Name: Customize the amplifier's Bluetooth identification.
• Set Connection Password: Add a password for Bluetooth pairing.
• Switch Sound Beep: Enable or disable notification sounds.
• Additional settings like shutdown timer may be available.

5. Maintenance

• Keep the amplifier board clean and free from dust. Use a soft, dry cloth for cleaning.
• Ensure adequate airflow around the board to prevent heat buildup, especially during prolonged use at high volumes.
• Avoid placing heavy objects on the board or subjecting it to physical shock.

6. Troubleshooting

• No Sound:
  • Check if the power supply is correctly connected and providing the required voltage/current.
  • Verify all speaker connections are secure and correctly wired.
  • Ensure the input source is active and the volume is turned up on both the amplifier and the source device.
  • Confirm the correct audio input method is selected (Bluetooth, AUX, USB).
• Distorted Sound:
  • Reduce the volume on both the amplifier and the audio source.
  • Check speaker impedance to ensure it matches the amplifier's specifications.
  • Ensure the power supply is stable and sufficient.
  • Check for loose connections or damaged cables.
• Bluetooth Connection Issues:
  • Ensure the amplifier is within range of your Bluetooth device.
  • Try unpairing and re-pairing the device.
  • Check for interference from other wireless devices.
• Protection Mechanism Activated: The amplifier features protection against overvoltage, undervoltage, overheating, clipping, and short circuits. If the amplifier stops working unexpectedly, check for these conditions. Disconnect power, resolve the issue (e.g., reduce load, ensure proper ventilation), and then reconnect power.

7. Specifications

8. User Tips

• For optimal sound quality, use high-quality audio cables and speakers that match the amplifier's power and impedance ratings.
• Experiment with the BASS, TREBLE, SUB VOL, and FREQ knobs to find the perfect sound balance for your listening environment and speaker setup.
• If using a USB flash drive, ensure audio files are in a compatible format (e.g., MP3, WAV).
• Consider using the YS Audio-APP for convenient remote control and customization of settings.

9. Warranty and Support

For any technical assistance, warranty claims, or support inquiries, please contact the seller or manufacturer directly. Keep your purchase records for reference.