A hearing aid device configured to be inserted into the ear canal of a user, comprising a receiver configured to be arranged in the ear canal; a directional microphone (4, 6) comprising two microphones (4, 6), termed a rear and a front microphone; and a feedback suppression system (FB, DSP) for counteracting leaked sound waves arising due to reflections from the ear drum as acoustic feedback, wherein the leaked sound waves are detected by the two microphones (4, 6), the hearing aid device further comprising an open fitting providing ventilation, characterised in that the two microphones (4, 6) are arranged in the ear canal at the same side of the receiver, when the hearing aid device is inserted into an ear canal of a user, and that sound is allowed to propagate between the microphones (4, 6) and the receiver, and said hearing aid device comprises a mould or housing provided with the front microphone and the rear microphone, where the mould or housing is configured to be inserted into the ear canal in such a way that the receiver or the sound outlet of the receiver is arranged closer to the eardrum than the rear microphone and that the rear microphone is arranged between the receiver and the front microphone, when viewed along a longitudinal axis of the hearing aid device, wherein the feedback suppression system (FB, DSP) comprises a feedback unit, said feedback unit being electrically connected to the front microphone and the rear microphone for receiving signals from said front microphone and rear microphone, respectively, said feedback unit being further connected to a processing unit, where said processing unit is configured for optimising the directional system of the hearing aid device by using said feedback unit to estimate a transfer function of an emitted signal from the receiver to the received signal from each microphone input to estimate the difference in both sound level and delay and/or phase, where said feedback unit is configured to detect a level difference between the two microphones, and configured to control: - a delay unit (d) configured to compensate for a propagation delay arising between the rear microphone and the front microphone, by delaying the output signal of the rear microphone and - an amplifier compensating for said level difference by amplifying the front microphone signal by a predefined amount more than the rear microphone signal or correspondingly attenuating the rear microphone signal relative to the front microphone signal, such that said feedback unit is configured to utilise all the received signals in order to reduce the acoustic feedback by adaptively controlling said amplifier and said delay unit (d). - a delay unit (d) configured to compensate for a propagation delay arising between the rear microphone and the front microphone, by delaying the output signal of the rear microphone and - an amplifier compensating for said level difference by amplifying the front microphone signal by a predefined amount more than the rear microphone signal or correspondingly attenuating the rear microphone signal relative to the front microphone signal, such that said feedback unit is configured to utilise all the received signals in order to reduce the acoustic feedback by adaptively controlling said amplifier and said delay unit (d).