Output power depends on input and supply conditions to deliver the intended performance. The amplifier provides sufficient output power only when the audio input level is adequate and the power supply voltage and current meet the required values. If the input or supply is insufficient, the available output power will be reduced. Higher power supply voltage increases available output power proportionally within the device design limits. This means that providing a higher supply voltage, within its rated range, allows more output power to be delivered. Speaker impedance affects output power. Speakers with different impedances will have different output power levels from the same amplifier. The stated output power will vary according to the impedance of the connected load. Practical guidance Ensure the audio source provides a sufficient input level. Use a power supply that meets the device's voltage and current requirements to achieve the desired output performance. When using speakers, be aware that different impedances will result in different output powers. Use scenarios Home audio setup: pair with compact bookshelf or small floorstanding speakers, ensuring the input source provides adequate level and the power supply remains within the required range for steady performance. DIY audio project: test with speakers of various impedances to observe how output power changes with load and supply conditions. Educational or multimedia environments: classroom or meeting room applications with small to medium speakers, where stable input and supply conditions help achieve consistent sound levels.