S350H 220Wx2 350W Bluetooth Power Amplifier Board - Treble & Bass

Our review of the S350H power amplifier board finds it best suited for DIY audio builders and small home theater setups who want high output and tonal control without a large chassis. The single biggest reason to consider this module is its dual TPA3255 HIFI chips delivering substantial power while offering independent treble and bass adjustment, which gives more control over tonal balance than a basic amp board. It connects via Bluetooth or AUX, accepts a wide 18V to 38V DC input, and includes protection features that make it a reliable choice for hobbyist installations.

Key Features

• TPA3255 HIFI Chip: Dual TPA3255 chips provide high-fidelity amplification and the potential for substantial output power suitable for larger bookshelf or satellite speakers.
• Wide Voltage Input: The 18V to 38V input range lets users choose from a variety of DC adapters to match desired power and headroom.
• Treble and Bass Control: Separate high and low frequency knobs allow precise tonal shaping so users can tighten mids, boost lows, or add clarity to highs.
• AUX and Bluetooth Connectivity: Bluetooth streaming plus an AUX input give flexible source options for both wireless and wired playback.
• Channel Adjustment: Independent left/right adjustment for high and low frequencies enables balancing across stereo pairs for better imaging.
• Protection Mechanisms: Built-in safeguards against short circuit, undervoltage, overvoltage and clipping help protect connected speakers and the board.

Who It's For

The S350H is ideal for audio DIYers, makers building powered speakers, and home theater tinkerers who need a compact module with strong output and tone controls. Its feature set makes it a good match for users who will install the board inside custom enclosures or retrofitted speaker cabinets and who can provide an appropriate DC supply.

It is less suited to someone who wants a finished, plug-and-play consumer amplifier with a chassis, remote, or cosmetic finish. Also, if a user needs very low-voltage operation or integrated streaming services, they should consider a different product that includes those conveniences out of the box.

Pros & Cons

Pros

• High output potential from dual TPA3255 chips gives strong, clear power for demanding speakers.
• Separate treble and bass controls provide meaningful tonal shaping beyond a single volume knob.
• Wide 18V-38V compatibility means many common DC adapters will work without special supplies.
• Protection features add reliability for long-term use in custom builds.

Cons

• The board is a module rather than a finished amplifier, so it requires installation and an external DC supply.
• No integrated remote or enclosure means users must handle mounting and protection themselves.

Specifications

Brand	Luqeeg
Amplifier chips	Dual TPA3255 HIFI chips
Power handling	Up to 220W x 2 + 350W (PMPO)
Input voltage	DC 18V - 38V
Connections	Bluetooth and AUX inputs
Protection	Short circuit, undervoltage, overvoltage, clipping

Our Verdict

The S350H amplifier board is a strong choice for builders who want a high-output, tone-adjustable module for home audio or small theater projects. With dual TPA3255 chips, wide voltage compatibility, and separate treble and bass controls, it offers excellent value for a DIY install-provided you are comfortable supplying a DC adapter and mounting the board in an enclosure.

Frequently Asked Questions

What DC plug size does this board use?
The board is compatible with common DC adapters using a 5.5mm x 2.1mm plug, or you can solder wires directly to the power terminals.

Can I stream wirelessly to this amplifier?
Yes, it has Bluetooth connectivity for wireless streaming as well as an AUX input for wired sources.

Does it include protection against faults?
Yes, the S350H includes short circuit, undervoltage, overvoltage and clipping protections to safeguard the board and connected speakers.