Beamforming not giving good results

Hi, I’m using matrix creator for a project. The voices were recorded at an approx distance of 1.5 metres from the matrix creator. I checked the output of the 8th channel and it seems like instead of cancelling the noise, it’s enhancing it. What can be the possible reason? I am using HAL package. I am not able to attach the voice recordings here. So if anyone can help, I can send him/her the recordings through the mail. TIA

Same here. The beamforming algorithm (delay & sum) seems just add all signals from 8 microphones without any weights.
Is there any one has modified their beamforming algorithm or figured out what is the problem of their code?

Thanks so much.