This paper proposes a new scheme to reduce coding bit rate in array based multichannel audio applications like the acoustic opening, which can be used for modern teleconference systems. The combination of beamforming techniques for source separation and wave field synthesis allows a significant coding bit rate reduction. To evaluate the quality of this new scheme, both objective and subjective tests have been carried out. The objective measurement system is based on the Perceptual Audio Quality Measure of the binaural signal that the listener would perceive in a real environment.