300W Mono Hi-Fi Amplifier Board 1943+5200 | Speaker Protection

Gaqqee 300W Mono Hi-Fi Power Amplifier Board – 1943+5200 Push-Pull Output Stage

Elevate your audio setup with this high-performance monoblock amplifier board from Gaqqee. Built around the proven A1943/C5200 high-power push-pull transistor output stage, this compact PCB delivers a massive 300W output into an 8Ω enclosure, making it the ideal foundation for powerful, clear, and stable Hi-Fi audio systems. Made in Mainland China.

Key Features

• High Power Output: Up to 300W (8Ω) — effortlessly drives large speakers, including 15-inch woofers.
• Premium Transistor Circuit: Uses A970/C2240 high-voltage audio push-pull transistors in a dual-differential input configuration, with A1145/C2705 for voltage amplification and A1837/C4793 for medium-power drive.
• Wide Supply Voltage Range: Accepts DC ±20V–±90V (recommended ±20V–±75V), accommodating a broad range of linear power supplies. Note: Switching power supplies are not suitable.
• Built-In Speaker Protection: Integrated speaker protection circuit safeguards your valuable speakers from damage during startup or fault conditions.
• Compact & Easy to Install: PCB dimensions of just 150mm × 75mm make integration into custom enclosures or audio projects straightforward.
• Single-Channel Design: This is a monoblock (single-channel) board. For stereo operation, two boards are required.
• Low Power Consumption: Efficient circuit topology minimizes idle dissipation without compromising output performance.

Technical Specifications

What's in the Box

• 1× Amplifier Board (PCB only — power supply and heatsink not included)

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Frequently Asked Questions

Q: Can this 300W mono amplifier board be used for stereo audio output?

A: This is a single-channel (monoblock) amplifier board. To achieve stereo output, you will need to purchase two boards — one for the left channel and one for the right channel.

Q: What type of power supply is compatible with this Hi-Fi amplifier board?

A: The board requires a linear DC power supply in the range of ±20V to ±90V (with ±20V–±75V recommended for optimal performance). Switching power supplies are not suitable and should not be used, as they may cause instability or damage.

Q: What speaker impedance does this amplifier board support?

A: The rated output of 300W is specified for an 8Ω speaker enclosure. It is capable of driving large speakers including 15-inch woofers when paired with an adequate linear power supply.

Q: Does the board come with a heatsink or enclosure?

A: The package includes the PCB amplifier board only. Given the high power output, it is strongly recommended to mount the output transistors on an appropriate heatsink to ensure proper thermal management during operation.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.