XY-S350H 220W2+350W Bluetooth Power Amplifier Board - High Power 2.1

In this review of the XY-S350H power amplifier board the bottom line is clear: this module is for hobbyists and DIY speaker builders who want a high-power, customizable 2.1 amplifier with strong bass and flexible inputs. The reviewer found the combination of dual TPA3251 stages, dedicated treble and bass controls, and reliable Bluetooth connectivity make it an unusually capable board for the price. It is not a plug-and-play consumer receiver but a performance-focused amplifier module for projects that can supply 18V or higher DC and appreciate adjustable tone controls.

Key Features

• TPA3251 HIFI CHIP: Dual TPA3251 amplifier chips deliver clear, high-current output that translates into tight midrange and powerful bass when paired with suitable speakers.
• Wide Voltage Range: The board supports an 18V to 36V input window so builders can choose supplies that balance power and efficiency for their enclosure.
• 220W2+350W Output: The stated peak music power provides plenty of headroom for dynamic passages and bass impact in a 2.1 speaker setup.
• Treble & Bass Control: Separate high and low frequency knobs let users shape soundstage and bass slam for different music styles without needing external EQ.
• Multiple Protection Modes: Built-in short circuit, undervoltage, overvoltage and clipping protection help safeguard speakers and the board during real-world use.
• Bluetooth with Custom Name: Reliable wireless pairing was reported to work better than expected, making it convenient for mobile audio sources.

Who It's For

The XY-S350H is best for electronics hobbyists, DIY speaker builders and home audio tinkerers who want a compact, high-power amplifier board they can mount inside a custom cabinet. It suits users who can provide a proper DC supply above 18V and who appreciate on-board tone controls and Bluetooth for convenience.

It is less suitable for casual buyers seeking a ready-made, wall-plug receiver with integrated display or remote control. If you need a full-featured, out-of-the-box home theater receiver with multiple HDMI inputs or automatic room calibration, look elsewhere.

Pros & Cons

Pros

• Very strong bass performance reported by customers, delivering a chest-moving low end when matched to good subwoofers.
• Bluetooth connectivity is dependable and easy to pair, improving usability for mobile audio.
• Adjustable treble and bass controls give meaningful tonal shaping without extra gear.
• Built-in protection features increase reliability in DIY installations.

Cons

• Requires a DC supply above 18V and some technical know-how to integrate safely into a cabinet or system.
• Not a finished consumer product-no remote, display, or advanced input switching.

Specifications

Model	XY-S350H
Brand	DAJUNGUO
Amplifier Chip	TPA3251 (dual)
Power Output (peak)	220W2 + 350W (2.1 configuration)
Working Voltage	DC 18V - 36V
Input Modes	AUX / Bluetooth / USB
Protection	Short circuit, undervoltage, overvoltage, clipping

Our Verdict

The XY-S350H is a strong-value amplifier module for DIYers who want serious output and tonal control without spending on a full receiver. With dual TPA3251 chips, robust protection and useful treble/bass knobs, it offers performance close to pro-class modules if you can supply a proper DC source and do basic installation work.

Frequently Asked Questions

Will the amplifier start with a 12V supply?
The board requires a working voltage above 18V and will not power up reliably with 12V.

Can I use a standard 5.5mm x 2.1mm DC adapter?
Yes; most market DC adapters with a 5.5mm x 2.1mm plug are compatible, or you can wire the positive and negative directly to the power terminals.

Does the board protect against speaker faults?
Yes; it includes short circuit, undervoltage, overvoltage and clipping protection to help protect the board and connected speakers.