A method of outputting an audio signal by an audio output apparatus, the method comprising: supplying a power to an audio output apparatus; calculating a first temperature value of the voice coil of the audio output apparatus based on power relative to the audio signal and a first initial temperature, using a heat transfer model algorithm, the heat transfer model algorithm representing a relation between a supplied power to the voice coil, an initial temperature value and a temperature value of the voice coil; determining, according to the calculated temperature value of the voice coil, a first adjusting gain value to adjust an output level of the audio signal to be output; adjusting the output level of the audio signal based on the first adjusting gain value; cutting-off the power supplied to the audio output apparatus; re-supplying power to the audio output apparatus after a time duration of power supply cut off; calculating a second initial temperature value based on the first temperature value of the voice coil and the time duration of power supply cut off using the heat transfer model algorithm; calculating a second temperature value of the voice coil based on the second initial temperature value and power relative to the audio signal using the heat transfer model algorithm; obtaining a second adjusting gain value to adjust the output level of the audio signal based on whether or not the second temperature value of the voice coil is within a threshold interval; adjusting the output level of the audio signal based on the second adjusting gain value; and outputting the audio signal with the adjusted output level to the voice coil of the audio output apparatus accordingly. supplying a power to an audio output apparatus; calculating a first temperature value of the voice coil of the audio output apparatus based on power relative to the audio signal and a first initial temperature, using a heat transfer model algorithm, the heat transfer model algorithm representing a relation between a supplied power to the voice coil, an initial temperature value and a temperature value of the voice coil; determining, according to the calculated temperature value of the voice coil, a first adjusting gain value to adjust an output level of the audio signal to be output; adjusting the output level of the audio signal based on the first adjusting gain value; cutting-off the power supplied to the audio output apparatus; re-supplying power to the audio output apparatus after a time duration of power supply cut off; calculating a second initial temperature value based on the first temperature value of the voice coil and the time duration of power supply cut off using the heat transfer model algorithm; calculating a second temperature value of the voice coil based on the second initial temperature value and power relative to the audio signal using the heat transfer model algorithm; obtaining a second adjusting gain value to adjust the output level of the audio signal based on whether or not the second temperature value of the voice coil is within a threshold interval; adjusting the output level of the audio signal based on the second adjusting gain value; and outputting the audio signal with the adjusted output level to the voice coil of the audio output apparatus accordingly.