Product description: 1. This amplifier board has good sound quality low distortion high efficiency small size and characteristics the entire board high-speed high-precision placement machine and infrared reflow soldering machine to ensure the stability of the board and the biggest advantage is that you can single-supply wide voltage power supply which greatly facilitates the unparalleled power of the occasion 2.Three units producing high-quality sealed potentiometer mixer without noise durability feel super good 3. Full oxidation of the radiator slot treatment not only excellent heat dissipation but nice 4. Audio output filter used in Taiwan imported high-current power inductors with Philips CBB capacitor filter low loss and distortion Caution: 1. Power supply limit voltage 26V do not exceed this voltage power supply do not reverse the positive and negative 2. Power supply is recommended for 24V 5A power supply filtering better 3. Speakers recommended 4-6 inch 6 or 8 ohm trumpet in Europe 4. Do not mutually audio output short or short to ground 5. Check carefully before energized make sure the wiring is correct before power