1. Introduction
Thank you for choosing the Sienwiny YS-S350H Bluetooth 5.1 Audio Amplifier Board. This high-performance 2.1 channel digital amplifier is designed to deliver powerful and clear audio, featuring a TPA3251 chip for efficient operation. It supports multiple audio input methods including Bluetooth 5.1, AUX, U Disk, and USB sound card, offering versatile connectivity for your audio system. This manual provides detailed instructions for assembly, operation, and maintenance to ensure optimal performance and longevity of your device.
2. Key Features
- Advanced system configuration using the TPA3251 digital power amplifier chip for efficient operation.
- High-quality materials ensuring a superior listening experience, safety, and durability.
- 2.1 channel power amplifier board with 220W x 2 (stereo) + 350W (subwoofer) output.
- Supports monolithic integration analog and high-voltage functions.
- Reduced crosstalk and improved sound quality compared to other amplifier processes.
- Highly integrated self-protection circuits, including overvoltage, undervoltage, overheating, clipping, and short circuit protection.
- Multiple audio input options: Bluetooth 5.1, AUX, U Disk, and USB sound card.
- Independent high and low frequency adjustment for left and right channels, and independent subwoofer adjustment with 360-degree infinite tuning.
- Supports YS Audio-APP control for enhanced functionality.
3. Specifications
| Parameter | Value |
|---|---|
| Product Name | 2.1 Channel Bluetooth Audio Power Amplifier Board |
| Product Model | YS-S350H |
| Bluetooth Version | 5.1 |
| Frequency Range | 20Hz-20KHz |
| Signal to Noise Ratio | 92dB |
| Power Supply | DC 18-38V / 10A (or above) |
| Audio Channel | 2.1 Channel |
| Audio Output | Left and Right Channels + Subwoofer |
| Audio Input | Bluetooth 5.1 + AUX + U Disk + USB Sound Card |
| Output Power (L/R) | 220W * 2 (Left and Right Channels) |
| Output Power (Subwoofer) | 350W |
| Max Output Power (L/R) | 220W/3Ω--36VDC, 175W/4Ω--36VDC, 100W/8Ω--36VDC |
| Max Output Power (Subwoofer) | 355W/2Ω--36VDC, 250W/3Ω--36VDC, 195W/4Ω--36VDC |
| Subwoofer Adapter Horn | 20W-200W / 2Ω-8Ω |
| Volume Adjustment | High-end encoder knob adjustment, smooth feel |
| Protection Mechanism | Overvoltage, Undervoltage, Overheating, Clipping, Short Circuit Protection |
| Unique Features | Support YS Audio-APP control |
| Product Size | 133mm x 130mm x 25mm |
| Product Weight | 380g |
4. Package Contents
The package includes the following items:
- 1 x YS-S350H Stereo Bluetooth Power Amplifier Module
- 1 x Upper Cover
- 1 x Lower Cover
- 8 x M2x3mm Screws
- 4 x M2x18 Copper Columns
- 4 x M2x4+3 Copper Columns
- 5 x Button Caps
- 1 x Screwdriver
5. Setup and Connections
5.1 Assembly
Assemble the amplifier board using the provided screws, copper columns, and covers as shown in the exploded view (Figure 4). Attach the upper and lower covers to protect the circuit board.
5.2 Power Supply Connection
Connect a DC power supply (18-38V, 10A or above) to the DC plug power supply input on the board. Ensure the correct voltage and current are used to prevent damage to the amplifier.
5.3 Audio Output Connections (Speakers)
Connect your speakers to the designated output terminals:
- Right Channel: Connect your right speaker.
- Left Channel: Connect your left speaker.
- Bass (Subwoofer): Connect your subwoofer. Ensure your subwoofer has an impedance between 2Ω and 8Ω and a power rating between 20W and 200W.
5.4 Audio Input Connections
The YS-S350H supports multiple audio input methods. Select one based on your source device:
- Bluetooth Input: For wireless connection from smartphones, tablets, or laptops.
- AUX Audio Input: For wired connection using a 3.5mm audio cable from devices like MP3 players, computers, or TVs.
- U Disk / USB Sound Card Input: For playing audio directly from a USB flash drive or using the board as an external USB sound card.
6. Operating Instructions
6.1 Basic Controls
The amplifier board features several knobs for audio adjustment:
- Master Volume Adjustment: Controls the overall output volume.
- Short Press (Master Volume): Play/Pause audio.
- Long Press (Master Volume): Power On/Off the amplifier.
- Left and Right Channel Treble: Adjusts the high frequencies for stereo channels.
- Left and Right Channel Bass: Adjusts the low frequencies for stereo channels.
- Bass Volume: Controls the volume of the subwoofer output.
- Subwoofer Frequency: Adjusts the crossover frequency for the subwoofer.
6.2 Bluetooth Connection
- Ensure the amplifier is powered on and in Bluetooth mode.
- On your mobile device, open the Bluetooth settings and search for available devices.
- Select "YS Audio" from the list to connect.
- Once connected, you will hear a confirmation beep, and you can start playing audio.
6.3 Mobile APP Control
The YS-S350H supports control via a dedicated mobile application (YS Audio-APP). This app allows for advanced settings and control:
- Revise Bluetooth Name: Personalize your amplifier's Bluetooth name.
- Set Connection Password: Add a password for secure Bluetooth connections.
- Switch Beep: Enable or disable connection beeps.
- Visual Operation: Control play mode, volume, sound effects, track selection (up/down), play/pause, and other playback modes directly from the app.
Note: When using the APP, ensure all necessary APP permissions are granted in your phone's settings. Some mobile phones may have compatibility issues, preventing Bluetooth connection if permissions are not correctly set.
6.4 Switching Audio Inputs
The amplifier automatically detects and switches between active audio inputs. If multiple inputs are connected, you may need to pause playback on one source to allow another to take priority, or manually select the input via the mobile app if available.
7. Maintenance
- Cleaning: Use a soft, dry cloth to clean the surface of the amplifier board. Do not use liquid cleaners or solvents.
- Environment: Keep the amplifier in a dry, well-ventilated area, away from direct sunlight, high temperatures, and humidity.
- Power Off: Always power off the amplifier when not in use for extended periods or before performing any connections/disconnections.
- Ventilation: Ensure the fan and ventilation openings are not obstructed to prevent overheating. The amplifier features a "Super long life Quiet fan" for cooling.
8. Troubleshooting
| Problem | Possible Cause / Solution |
|---|---|
| No power / Amplifier not turning on | Check power supply connections. Ensure the power adapter meets the DC 18-38V / 10A (or above) requirement. Verify the power outlet is functional. Long press the Master Volume knob to power on. |
| No sound output | Check speaker connections. Ensure audio input source is active and correctly connected. Adjust master volume. Verify the correct input mode is selected (Bluetooth, AUX, USB). |
| Distorted sound | Reduce input volume from the source device. Check speaker impedance compatibility (2Ω-8Ω for subwoofer, standard for L/R). Ensure power supply is stable and sufficient. Adjust treble/bass knobs. |
| Bluetooth connection issues | Ensure the amplifier is in Bluetooth mode. Clear previous Bluetooth pairings on your device. Make sure the mobile APP has all necessary permissions granted. Try restarting both the amplifier and your Bluetooth device. |
| Amplifier overheating | Ensure adequate ventilation around the unit. Check if the cooling fan is obstructed. Reduce volume or usage time if operating at high power for extended periods. The amplifier has built-in overheating protection. |
| Subwoofer not working or weak bass | Check subwoofer connection. Adjust Bass Volume and Subwoofer Frequency knobs. Ensure subwoofer impedance is within the supported range (2Ω-8Ω). |
9. User Tips
- Power Supply Selection: For optimal performance, especially when driving high-power speakers, use a robust DC power supply that provides at least 10A at the recommended voltage (18-38V).
- Subwoofer Compatibility: The YS-S350H supports subwoofers with impedances of 2, 3, 4, and 8 ohms. For example, a 3-ohm subwoofer is fully compatible.
- Audio Input Mixing: The amplifier typically switches between audio inputs rather than mixing them simultaneously. If you have multiple sources connected, ensure only one is actively playing at a time for clear audio.
- APP Permissions: If you experience issues connecting via the mobile app, double-check your phone's settings to ensure the app has all required permissions, especially for Bluetooth access.
10. Warranty and Support
For any technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact your retailer or the manufacturer's customer support. Keep your purchase receipt as proof of purchase.
