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 ...

Land Rover's all-new Freelander, to be dubbed LR2 Stateside, will be the first-ever vehicle to use Dolby® Pro Logic II® 7.1 surround sound. Sure, almost all vehicles have a rudimentary version ...