A noise cancellation system for a noise cancellation enabled audio device, in particular headphone (HP), the system comprising - a first noise filter (HLF) having a first fixed frequency response matched to a high leakage condition of the audio device and being designed to process a noise signal; - a second noise filter (LLF) having a second fixed frequency response matched to a low leakage condition of the audio device and being designed to process the noise signal; - a combiner (CMB) configured to provide a compensation signal (cm) based on a combination of an output of the first noise filter (HLF) amplified with a first adjustable gain factor and an output of the second noise filter (LLF) amplified with a second adjustable gain factor; and - an adaptation engine (ADP) configured to estimate a leakage condition of the audio device based on an error noise signal (nerr) and to adjust at least one of the first and the second adjustable gain factors based on the estimated leakage condition; wherein - the error noise signal is a feedback noise signal recorded by a feedback noise microphone (FB_MIC) located in proximity to a speaker (SP) of the audio device; and - the first noise filter (HLF) and the second noise filter (LLF) are each of the same noise cancellation type, wherein the noise cancellation type is one of - a feedforward noise cancellation type, wherein the noise signal is an ambient noise signal, in particular recorded by an ambient noise microphone (FF_MIC) of the audio device; and - a feedback noise cancellation type, wherein the noise signal is the error noise signal. - a first noise filter (HLF) having a first fixed frequency response matched to a high leakage condition of the audio device and being designed to process a noise signal; - a second noise filter (LLF) having a second fixed frequency response matched to a low leakage condition of the audio device and being designed to process the noise signal; - a combiner (CMB) configured to provide a compensation signal (cm) based on a combination of an output of the first noise filter (HLF) amplified with a first adjustable gain factor and an output of the second noise filter (LLF) amplified with a second adjustable gain factor; and - an adaptation engine (ADP) configured to estimate a leakage condition of the audio device based on an error noise signal (nerr) and to adjust at least one of the first and the second adjustable gain factors based on the estimated leakage condition; - the error noise signal is a feedback noise signal recorded by a feedback noise microphone (FB_MIC) located in proximity to a speaker (SP) of the audio device; and - the first noise filter (HLF) and the second noise filter (LLF) are each of the same noise cancellation type, wherein the noise cancellation type is one of - a feedforward noise cancellation type, wherein the noise signal is an ambient noise signal, in particular recorded by an ambient noise microphone (FF_MIC) of the audio device; and - a feedback noise cancellation type, wherein the noise signal is the error noise signal. - a feedforward noise cancellation type, wherein the noise signal is an ambient noise signal, in particular recorded by an ambient noise microphone (FF_MIC) of the audio device; and - a feedback noise cancellation type, wherein the noise signal is the error noise signal. <EOS>