Introduction
The DAJUNGUO S350HS is a 2.1 channel Bluetooth power amplifier board featuring the TPA3251 high-fidelity chip. It is designed to provide stereo audio output for left and right channels, along with a dedicated subwoofer output. This module supports multiple input methods including Bluetooth, AUX, and USB drive, and offers comprehensive treble and bass control for a customized audio experience. It incorporates various protection mechanisms to ensure safe and reliable operation.
Setup Instructions
Package Contents
- S350HS Amplifier Board
- Screwdriver (for assembly)
Assembly
The S350HS amplifier board is provided as an unassembled kit. Carefully mount the top and bottom panels onto the amplifier card using the provided stand-offs and screws. Ensure all components are securely fastened.
Component Overview
Power Supply Connection
Connect a DC power supply within the range of 12V to 38V to the 2PIN Input Socket (DC 12-38V, 5.5x2.5mm). Ensure the power supply provides above 10A for optimal performance. The gold-plated high current shielded DC socket is designed to prevent sparks during connection.
Speaker Connections
Connect your left (L) and right (R) channel speakers, and your subwoofer (S) to the corresponding output terminals on the amplifier board. Ensure correct polarity for all speaker connections.
Bluetooth Antenna Connection
Attach a compatible Bluetooth antenna to the IPEX(MHF1) Bluetooth Antenna Base. An antenna with a 3.22mm/0.127inch connector is required. MHF4 connectors (2.23mm/0.088inch) are not compatible.
Operating Instructions
Power On/Off
Use the power switch located on the front panel to turn the amplifier on or off.
Input Selection
The S350HS supports Bluetooth, AUX, and USB drive inputs. The input mode can be switched using the multifunctional knob.
Bluetooth Pairing
- Ensure the amplifier is powered on and in Bluetooth mode.
- On your device (e.g., mobile phone, laptop), search for available Bluetooth devices.
- Select the S350HS from the list to pair.
- The Bluetooth name and password can be customized via a dedicated application.
Multifunctional Knob Operation
The central multifunctional knob controls various playback and mode settings:
- 1 Click: Play / Pause
- 2 Clicks: Next Song
- 3 Clicks: Previous Song
- 4 Clicks: Switch Mode
- 5 Clicks: Factory Reset
- Long press: Power on / Standby
Volume, Treble, and Bass Control
Adjust the dedicated knobs for Master Volume, R&L Treble, R&L Bass, Subwoofer Volume, and Subwoofer Frequency to fine-tune your audio output.
Maintenance
To ensure the longevity and optimal performance of your S350HS amplifier board, follow these maintenance guidelines:
- Keep the device in a dry, well-ventilated area, away from direct sunlight and extreme temperatures.
- Avoid exposing the amplifier to moisture or liquids.
- Clean the exterior with a soft, dry cloth. Do not use harsh chemicals or abrasive cleaners.
- Ensure proper airflow around the heatsink and fan to prevent overheating.
Troubleshooting
The S350HS Bluetooth power amplifier board includes multiple protection mechanisms. If an issue occurs, the device may enter a protected state. Common protection features include:
- Short-circuit protection
- Over-current protection
- Over-heat protection
- Anti-reverse protection (for power input)
If the amplifier stops functioning or exhibits unusual behavior, check the following:
- No Power: Verify the power supply connection and ensure the power switch is in the 'ON' position. Check if the power adapter is functioning correctly and provides the specified voltage (12-38V DC) and current (above 10A).
- No Sound: Confirm that the correct input mode is selected. Check all audio cable connections (AUX, USB, speaker wires). Ensure the volume levels are not set to minimum on both the amplifier and the source device.
- Distorted Sound: Reduce the volume to check if distortion is due to overdriving. Ensure speaker impedance matches the amplifier's capabilities. Check for loose speaker connections.
- Bluetooth Connection Issues: Ensure the amplifier is in Bluetooth mode and your device's Bluetooth is enabled. Try unpairing and re-pairing the device. Ensure the antenna is securely connected.
- Overheating: Ensure the amplifier has adequate ventilation and the fan is not obstructed. If the device feels excessively hot, disconnect power and allow it to cool before resuming use.
Specifications
| Parameter | Value |
|---|---|
| Model | S350HS |
| Audio Chip | TPA3251 |
| Audio Channel | 2.1 Channel |
| Power Supply | DC 12-38V (above 10A recommended) |
| Bluetooth Version | 5.1 |
| Audio Input | Bluetooth, AUX, USB Flash Drive |
| Frequency Range | 20Hz - 20KHz |
| L&R Channel Max Output Power | 220W @ 3Ω/36VDC; 160W @ 4Ω/36VDC; 80W @ 8Ω/36VDC |
| Subwoofer Max Output Power | 350W @ 2Ω/36VDC; 160W @ 4Ω/36VDC; 80W @ 8Ω/36VDC |
| Protection Mechanisms | Overvoltage, Undervoltage, Clipping, Short Circuit, Overheating, Anti-reverse |
| Product Dimensions (L x W x H) | 5.90in x 5.15in x 1.02in (150mm x 131mm x 26mm) |
| Item Weight | 11.5 ounces |
| Material | Metal, Plastic |
Warranty and Support
DAJUNGUO is committed to customer satisfaction. If you encounter any questions about the product or experience quality issues, please contact our customer service. We offer 7x24 hours after-sales service to provide a satisfactory resolution.
For support, please refer to the contact information provided with your purchase or visit the official DAJUNGUO store on Amazon.
