ADAU1452 SigmaStudio 4.1, detail information about Beam Forming Designer

I use the ADAU1452 with the Sigma Studio ver.4.6.

I use 2 microphone beamforming this function, but the actual measurement is different from the above field type, what could be the problem?

My hardware is 2 MEMS modules with a spacing of 15cm.

Audio Signal Processors

adau1452

SigmaDSP Audio Processors