A self-diagnosis method performed in audio playback equipment comprising an audio playback unit having at least one loudspeaker and an audio capture unit having at least one microphone, the self-diagnosis method comprising the steps of: · acquiring or producing emission audio test signals (Se) and outputting them via the loudspeaker(s), thereby producing sound test signals (So); · acquiring reception audio test signals (Sr) produced by the microphone (s) as a result of the microphones receiving the sound test signals; · analyzing the reception audio test signals in order to establish a first diagnosis of the audio playback unit and a second diagnosis of the audio capture unit; · the emission audio test signals (Se) comprising a first emission signal output by at least one first loudspeaker, the first emission signal comprising a first sinusoidal signal at a frequency of less than 100 hertz, and the reception audio test signals comprising at least one first reception signal produced by at least one first microphone, the analysis comprising the step of verifying that the first emission signal is indeed present in the first reception signal; the method further comprising the steps, if the first emission signal is indeed present in the first reception signal, · of performing a spectral analysis in order to detect a residual noise signal that is also present in the first reception signal, and of verifying whether the residual noise signal has a frequency higher than a predefined frequency and a level higher than a predefined level, the predefined frequency being greater than the frequency of the first emission signal, the spectral analysis comprising the steps of using a spectral measurement of the first reception signal, the spectral measurement presenting a peak at the frequency of the fundamental, possibly together with other peaks at the frequencies of harmonics, and of eliminating said peaks in order to obtain a spectrum of the residual noise signal; · and, if so, of detecting a sealing defect in a speaker enclosure of the audio playback equipment incorporating the first loudspeaker. · acquiring or producing emission audio test signals (Se) and outputting them via the loudspeaker(s), thereby producing sound test signals (So); · acquiring reception audio test signals (Sr) produced by the microphone (s) as a result of the microphones receiving the sound test signals; · analyzing the reception audio test signals in order to establish a first diagnosis of the audio playback unit and a second diagnosis of the audio capture unit; · the emission audio test signals (Se) comprising a first emission signal output by at least one first loudspeaker, the first emission signal comprising a first sinusoidal signal at a frequency of less than 100 hertz, and the reception audio test signals comprising at least one first reception signal produced by at least one first microphone, the analysis comprising the step of verifying that the first emission signal is indeed present in the first reception signal; the method further comprising the steps, if the first emission signal is indeed present in the first reception signal, · of performing a spectral analysis in order to detect a residual noise signal that is also present in the first reception signal, and of verifying whether the residual noise signal has a frequency higher than a predefined frequency and a level higher than a predefined level, the predefined frequency being greater than the frequency of the first emission signal, the spectral analysis comprising the steps of using a spectral measurement of the first reception signal, the spectral measurement presenting a peak at the frequency of the fundamental, possibly together with other peaks at the frequencies of harmonics, and of eliminating said peaks in order to obtain a spectrum of the residual noise signal; · and, if so, of detecting a sealing defect in a speaker enclosure of the audio playback equipment incorporating the first loudspeaker.