Power supply recommended: DC dual power supply ±65V with better filtering. This ensures clean, stable power for reliable operation and better audio performance. Safety and protection: The audio output has short circuit protection; however, please avoid shorting to minimize risk and protect the circuit. Voltage requirements and guidance: The rated power supply voltage is dual power supply ±65V. It can operate normally at ±58V to ±70V, but must not exceed ±70V or it will burn out. If using a ring cow, voltage may vary because it does not have a voltage regulator function. If the power grid fluctuates, please leave margin and account for variations. Do not connect the positive and negative poles of the power supply incorrectly to avoid burning the board. Speaker compatibility: The recommended speaker is 1018 inches with 4 ohm to 8 ohm impedance. Use scenarios DIY audio amplifier projects at home or in a workshop, where a stable dualsupply and proper protection improve reliability and performance. Smallroom playback or rehearsal setups requiring clear, constrained power delivery and compatibility with common 48 ohm speakers. Educational or lab testing of dualsupply audio circuits, where clear voltage guidelines and protection features help teach safe operation and troubleshooting.