BINAURAL HEARING AID SYSTEM PROVIDING A BEAMFORMING SIGNAL OUTPUT AND COMPRISING AN ASYMMETRIC VALVE STATE

The present disclosure relates to a binaural hearing aid system comprising hearing aids for placement at, or in, a user's left and right ear, the hearing aids each comprising a microphone arrangement, a wireless communications unit, a receiver, and a sound channel with a valve, which is movable from an open state to an closed state and from a closed state to an open state. The binaural hearing aid system further comprises a signal processing arrangement adapted for generating a beamformed signal based on microphone signals supplied by either or both of the microphone arrangement(s) and for applying the beamformed signal to either or both of the receiver(s), and a valve control arrangement, which has an asymmetric state, in which asymmetric state the valve control arrangement is configured to asymmetrically control the valves in each hearing aid by moving the valves into positions wherein one of the valves is opened more than the other.