Power supply recommendations Use a DC dual power supply with plus/minus 65 V (±65 V) and good input filtering to ensure clean, stable operation and reduced noise. Voltage range and safety The rated supply voltage is dual ±65 V and it can operate normally within approximately ±58 V to ±70 V. Do not exceed ±70 V, or the unit may be damaged. If the supply is unregulated or of a type without a voltage regulator function, the voltage may vary. Allow margin for power grid fluctuations. Do not connect the positive and negative terminals in reverse to avoid burning the board. Polarity and protection cautions Ensure correct polarity when connecting the power supply to prevent damage to the board. Speaker recommendations Use a speaker in the 10 to 18 inch range with a impedance of 4 ohm to 8 ohm for performance. Output protection The audio output features shortcircuit protection, but avoid creating short circuits to preserve safety and reliability. Use scenarios DIY hifi or home audio amplifier projects that require a clean ±65 V dual supply and solid power delivery. Small to midsized PA or home theater setups using 48 ohm speakers for reliable, protected output. Lab bench testing and prototyping of audio electronics that benefit from a stable dual supply and builtin shortcircuit protection.