Product Features: 1. High power output, reaching up to 300W, effortlessly drives large speakers. 2. Utilises high-voltage-rated audio push-pull transistors for clear sound quality and exceptional stability. 3. Wide power supply range supporting ±20V-90V, accommodating diverse power environments. 4. Robust drive capability effortlessly powers 15-inch speakers with outstanding performance. 5. Compact dimensions facilitate installation, suitable for diverse audio systems. Product Description: This upgraded monoblock amplifier board features the 1943/5200 high-power push-pull output stage. Designed as a single-channel rear amplifier board, dual-channel operation requires two amplifier boards. Circuit design employs A970/C2240 high-voltage audio push-pull transistors in a dual differential configuration, with A1145/C2705 for voltage amplification. Medium-power A1837/C4793 transistors drive the output stage, utilising A1943/C5200 high-power push-pull transistors. The power supply range is exceptionally wide, accommodating DC voltages from ±20V to ±90V. Provided sufficient power is supplied, it effortlessly achieves an output power of 300W, delivering formidable drive capability that handles 15-inch speakers with ease. Product Specifications: Supply Voltage: DC ±20-90V (Recommended: ±20V-75V. Do not exceed voltage limits. Switching power supplies are unsuitable.) Output Power: 300W (8/ enclosure) PCB Dimensions: 150mm / 75mm Product Listing: 1x Amplifier Board