S350HS Bluetooth Power Amplifier Board TPA3251 2.1 Channel - HighPower

Our review of the S350HS Bluetooth Power Amplifier Board finds it best suited to hobbyists and DIY home audio builders who need a compact 2.1 channel module with real power headroom. The single biggest reason to buy is its use of dual TPA3251 amplifier chips delivering a combined continuous output capable of driving a full stereo pair plus a subwoofer, while supporting multiple inputs including Bluetooth, AUX and USB drive playback for flexible source options.

Key Features

• TPA3251 HIFI CHIP: Dual TPA3251 chips provide high-fidelity amplification and strong continuous power for clear, dynamic stereo and subwoofer output.
• Wide voltage input: The board accepts DC 12-38V so it can run from a range of power supplies and battery systems for flexible installations.
• Multiple input methods: Bluetooth, AUX and USB drive input make it easy to connect phones, TVs, and computers without extra adapters.
• Trebles and bass control: Dedicated high and low frequency knobs let the listener shape tone and add bass impact for different music or movie use.
• Protection features: Built-in short-circuit, over-current, over-temperature and reverse polarity protection help keep the module and connected speakers safe under fault conditions.
• Compact 2.1 form factor: A single board supports left/right channels plus a powered subwoofer output, simplifying small home theater or desktop audio builds.

Who It's For

This amplifier board is aimed at tinkerers, DIY audio builders and small-room home theater users who want a compact, powerful 2.1 solution with tone controls and modern inputs. It works well for powering bookshelf speakers plus a powered sub or an active subwoofer when paired with an appropriate power supply.

Those who want an out-of-the-box finished stereo receiver with remote control, integrated streaming services or factory speaker matching may prefer a completed consumer amplifier. Installers should also account for the need to supply a DC power adapter (36V 8A is a typical option) and provide adequate ventilation for continuous high-power use.

Pros & Cons

Pros

• High continuous power from two TPA3251 chips gives strong stereo and sub output for music and movies.
• Flexible connectivity with Bluetooth, AUX and USB drive inputs for many source devices.
• Tone controls let users fine tune treble and bass for room acoustics or personal taste.
• Comprehensive protection mechanisms reduce risk of damage during faults.

Cons

• As a bare amplifier board it requires an external DC supply and a cooled installation, so it is not a plug-and-play finished receiver.
• Physical cooling and wiring best practices are needed for sustained maximum output.

Specifications

Chip	TPA3251 (dual)
Channels	2.1 channel
Max output (peak)	220W + 220W + 350W
Working voltage (DC)	12-38V (typical kit uses DC36V 8A)
Input modes	Bluetooth, AUX, USB drive
Protection	Short-circuit, over-current, over-heat, reverse polarity

Our Verdict

The S350HS board is a strong-value option for DIYers who need a compact, powerful 2.1 channel amplifier based on the TPA3251 platform; it pairs useful tone controls and multiple inputs with solid protection features. Buy it if you can provide an appropriate DC supply and enclosure with cooling - it delivers high output and flexibility at a modest cost compared with assembled receivers.

Frequently Asked Questions

What power supply does this require?
The board accepts DC 12-38V; many users pair it with a 36V 8A adapter for full output.

Can it play from a USB drive?
Yes, there is USB drive input in addition to Bluetooth and AUX for playing audio files directly.

Is the board protected against wiring faults?
Yes, it includes short-circuit, over-current, over-temperature and anti-reverse protection to reduce risk of damage.