Dolby Pro Logic was introduced shortly after for playback of the center channel as well. Pro Logic II added left and right surround channels (5.1), and Pro Logic IIx added support for 6.1 and 7.1 ...

Dolby has certified the tech ... and then one receiver for each subwoofer or speaker you want to connect. So, for a 7.1.2 Atmos setup, you're looking at $4,800 (£3,790) in connectivity.