An earpiece configured to be worn in an ear of a user, the earpiece comprising: - a first input transducer configured for receiving sound from the ear canal of the user's ear, the first input transducer being configured for providing a first input transducer signal; - an output transducer configured for providing sound to the ear canal, the output transducer being configured for providing an output transducer signal; - a processing unit connected to the output transducer and the first input transducer, the processing unit comprises an active occlusion cancellation algorithm configured to generate the output transducer signal based on at least the first input transducer signal for providing active occlusion cancellation; wherein the earpiece further comprises: - an acoustic filter configured for improving the active occlusion cancellation, the acoustic filter comprising: - a vent channel for venting the ear canal, wherein the vent channel has a length of about 22 mm and a diameter of about 0.8 mm, and - an acoustic vent resonance cancelling filter implemented in the vent channel; wherein the acoustic vent resonance cancelling filter is an acoustic resistive material; and wherein the vent channel provides reduction of subsonic or low-frequency sound pressure levels in the ear canal of the user, wherein the acoustic vent resonance cancelling filter is defined by an acoustic impedance value and wherein the acoustic vent resonance cancelling filter has an acoustic impedance value in the range of 10 - 500 Pa*s/m. - a first input transducer configured for receiving sound from the ear canal of the user's ear, the first input transducer being configured for providing a first input transducer signal; - an output transducer configured for providing sound to the ear canal, the output transducer being configured for providing an output transducer signal; - a processing unit connected to the output transducer and the first input transducer, the processing unit comprises an active occlusion cancellation algorithm configured to generate the output transducer signal based on at least the first input transducer signal for providing active occlusion cancellation; wherein the earpiece further comprises: - an acoustic filter configured for improving the active occlusion cancellation, the acoustic filter comprising: - a vent channel for venting the ear canal, wherein the vent channel has a length of about 22 mm and a diameter of about 0.8 mm, and - an acoustic vent resonance cancelling filter implemented in the vent channel; wherein the acoustic vent resonance cancelling filter is an acoustic resistive material; and wherein the vent channel provides reduction of subsonic or low-frequency sound pressure levels in the ear canal of the user, wherein the acoustic vent resonance cancelling filter is defined by an acoustic impedance value and wherein the acoustic vent resonance cancelling filter has an acoustic impedance value in the range of 10 - 500 Pa*s/m. - a vent channel for venting the ear canal, wherein the vent channel has a length of about 22 mm and a diameter of about 0.8 mm, and - an acoustic vent resonance cancelling filter implemented in the vent channel; wherein the acoustic vent resonance cancelling filter is an acoustic resistive material; and wherein the vent channel provides reduction of subsonic or low-frequency sound pressure levels in the ear canal of the user, wherein the acoustic vent resonance cancelling filter is defined by an acoustic impedance value and wherein the acoustic vent resonance cancelling filter has an acoustic impedance value in the range of 10 - 500 Pa*s/m. channel; wherein the acoustic vent resonance cancelling filter is an acoustic resistive material; and wherein the vent channel provides reduction of subsonic or low-frequency sound pressure levels in the ear canal of the user, wherein the acoustic vent resonance cancelling filter is defined by an acoustic impedance value and wherein the acoustic vent resonance cancelling filter has an acoustic impedance value in the range of 10 - 500 Pa*s/m.