A hearing aid comprising: - an ambient microphone adapted to receive and convert environmental sound into an electronic input signal, - a hearing loss processor adapted to compensate the electronic input signal in accordance with a hearing loss of the user and generating an electronic output signal, - a receiver adapted to receive and convert a combined signal to the receiver into an acoustic output signal, - an ear canal microphone adapted for converting ear canal sound pressure into an ear canal signal, - an occlusion suppressor connected for reception and processing of the ear canal signal and for transmitting an occlusion suppression signal, and - a signal combiner combining the occlusion suppression signal and the electronic output signal and transmitting the combined signal to the receiver, wherein - the receiver is selected from the group consisting of a) a receiver with a low frequency response with a lower cut-off frequency less than 10 Hz and b) a receiver capable of holding a static pressure in a sealed volume and having a rear cavity pressure equalization path to atmospheric pressure, and - an acoustical vent extending through or around a housing or an earmould of the hearing aid, characterized in that - high pass characteristics of a frequency response of the acoustical vent comprises a transition frequency situated in a frequency range below the high pass cut-off frequency of the acoustical vent, - the transition frequency separating a first order frequency response roll-off at frequencies below the transition frequency and second order frequency response roll-off at frequencies above the transition frequency, and wherein - the transition frequency is situated between 3 octaves below and 3 octaves above a lower cut-off frequency of a frequency response of the ear canal microphone. - an ambient microphone adapted to receive and convert environmental sound into an electronic input signal, - a hearing loss processor adapted to compensate the electronic input signal in accordance with a hearing loss of the user and generating an electronic output signal, - a receiver adapted to receive and convert a combined signal to the receiver into an acoustic output signal, - an ear canal microphone adapted for converting ear canal sound pressure into an ear canal signal, - an occlusion suppressor connected for reception and processing of the ear canal signal and for transmitting an occlusion suppression signal, and - a signal combiner combining the occlusion suppression signal and the electronic output signal and transmitting the combined signal to the receiver, wherein - the receiver is selected from the group consisting of a) a receiver with a low frequency response with a lower cut-off frequency less than 10 Hz and b) a receiver capable of holding a static pressure in a sealed volume and having a rear cavity pressure equalization path to atmospheric pressure, and - an acoustical vent extending through or around a housing or an earmould of the hearing aid, - high pass characteristics of a frequency response of the acoustical vent comprises a transition frequency situated in a frequency range below the high pass cut-off frequency of the acoustical vent, - the transition frequency separating a first order frequency response roll-off at frequencies below the transition frequency and second order frequency response roll-off at frequencies above the transition frequency, and wherein - the transition frequency is situated between 3 octaves below and 3 octaves above a lower cut-off frequency of a frequency response of the ear canal microphone.