Normally you would get Dolby Atmos DD+ from streaming signals such as netflix-this is a lossy atmos signal,so Atmos, lite. Dolby Atmos Multi Channel PCM is I believe from Blue ray/4k disks and is a lossless signal so full atmos-do you get two modes with what inputs? Otherwise it is dependent upon what signal output device is sending bitstream or pcm to soundbar-a pcm signal from source would mean device has mixed atmos signal and is sending pcm,if source set to bitstream soundbar would be processing atmos signal