An audio system for an ear mountable playback device comprising - a speaker configured to generate a speaker signal on the basis of an audio output signal; - an error microphone (FB_MIC) configured to generate a disturbed audio signal on the basis of ambient noise (NOISE) and the speaker signal; - a further microphone (FF_MIC) configured to generate a noise signal on the basis of the ambient noise (NOISE); - a first noise filter configured to - generate a first compensation signal by applying filter operations to the noise signal; and - be adapted based on a compensated error signal; - a first mixer configured to generate the audio output signal by superimposing an audio signal, the first compensation signal and a second compensation signal; - a compensation filter configured to - generate a third compensation signal by applying filter operations to the audio signal; and - be adapted based on an acoustic leakage condition; - a second noise filter configured to generate the second compensation signal by applying filter operations to an intermediate compensation signal; - a third mixer configured to generate said intermediate compensation signal by subtracting the third compensation signal from the disturbed audio signal; - an error compensation unit comprising an adjustable filter element configured to generate an adjusted compensation signal by applying filter operations to the third compensation signal, and a second mixer configured to generate the compensated error signal by subtracting the adjusted compensation signal from the disturbed audio signal; and - a detection unit configured to estimate the acoustic leakage condition on the basis of the first noise filter or of the disturbed audio signal and the audio output signal. - a speaker configured to generate a speaker signal on the basis of an audio output signal; - an error microphone (FB_MIC) configured to generate a disturbed audio signal on the basis of ambient noise (NOISE) and the speaker signal; - a further microphone (FF_MIC) configured to generate a noise signal on the basis of the ambient noise (NOISE); - a first noise filter configured to - generate a first compensation signal by applying filter operations to the noise signal; and - be adapted based on a compensated error signal; - generate a first compensation signal by applying filter operations to the noise signal; and - be adapted based on a compensated error signal; - a first mixer configured to generate the audio output signal by superimposing an audio signal, the first compensation signal and a second compensation signal; - a compensation filter configured to - generate a third compensation signal by applying filter operations to the audio signal; and - be adapted based on an acoustic leakage condition; - generate a third compensation signal by applying filter operations to the audio signal; and - be adapted based on an acoustic leakage condition; - a second noise filter configured to generate the second compensation signal by applying filter operations to an intermediate compensation signal; - a third mixer configured to generate said intermediate compensation signal by subtracting the third compensation signal from the disturbed audio signal; - an error compensation unit comprising an adjustable filter element configured to generate an adjusted compensation signal by applying filter operations to the third compensation signal, and a second mixer configured to generate the compensated error signal by subtracting the adjusted compensation signal from the disturbed audio signal; and - a detection unit configured to estimate the acoustic leakage condition on the basis of the first noise filter or of the disturbed audio signal and the audio output signal.