DAJUNGUO S350HS TPA3251 2.1 Bluetooth Power Amplifier

DAJUNGUO S350HS is a compact 2.1-channel Bluetooth power amplifier board built on TPA3251 chips, delivering up to 220W per satellite channel plus 350W to a subwoofer for powerful, tunable audio systems.

The S350HS amplifier module combines modern Class-D TPA3251 amplification, flexible inputs, and tone controls into a durable black PCB designed for DIY audio projects, home theater upgrades, and custom speaker systems. It accepts a wide DC supply (12V–38V), supports Bluetooth streaming, AUX and USB drive playback, and includes protective circuitry for reliable operation in demanding setups.

How much power can this amplifier actually deliver?

The S350HS uses two TPA3251 amplifiers to produce stereo satellite outputs and one channel for a powered subwoofer. Peak-rated outputs are 220W for each left and right satellite plus 350W for the low-frequency channel when supplied within the recommended voltage and load conditions.

• Satellite channels: up to 220W each using TPA3251 class-D outputs
• Subwoofer channel: up to 350W for deep bass impact
• Wide DC input: 12V to 38V to suit portable or bench power supplies
• Works best with properly matched speaker impedances for sustained power

What inputs and connectivity does the board support?

S350HS offers three common ways to feed audio so you can connect phones, TVs, PCs or USB media quickly. Bluetooth handles wireless streaming, RCA/AUX accepts line-level sources, and a USB drive input plays stored audio files directly.

• Bluetooth for smartphone and tablet streaming
• AUX/RCA line-in for TVs, DACs and mixers
• USB drive playback for standalone music files
• Simple front-panel switching between inputs

Can I shape the sound to match my room and speakers?

Yes. Unlike simple single-knob amps, the S350HS provides separate treble and bass controls so you can fine-tune tonal balance and emphasize clarity or low-end punch as needed. These analog controls add flexibility for different listening environments and content types.

• Adjustable treble knob for clearer highs and vocals
• Adjustable bass knob to increase subwoofer impact
• Helps tailor sound for small rooms, parties, or studio monitoring
• Useful for compensating speaker coloration or room acoustics

What safety and reliability features are built in?

The board includes several protection mechanisms to prevent damage from common faults and ensure longer component life in continuous-use scenarios. If a fault is detected, the module will report and limit operation to protect itself and connected speakers.

• Short-circuit protection to prevent speaker or wiring faults
• Over-current and over-temperature safeguards for sustained use
• Anti-reverse polarity protection on DC input
• Onboard monitoring that signals fault conditions to protect the amp

Who this is for: The DAJUNGUO S350HS is aimed at hobbyists, sound installers, and DIY home theater builders who need a high-power, compact amplifier board with wireless streaming and tone shaping. It suits garage speakers, powered subwoofer demos, compact PA setups, and anyone upgrading passive speakers with a modern Class-D solution—provided you match power supply and speaker impedance to the amp's ratings. The product also includes 24/7 after-sales support for troubleshooting and warranty concerns, making it a practical choice for first-time electronics integrators and experienced audio tinkerers alike.