Lt/Rt

Lt/Rt (Left total / Right total) stereo indicates two channels of program that exist as an encoded matrix of four discrete source channels. When Dolby® decoded, the two-channel matrix will play back as LCRS (left, center, right, surround). Lt/Rt tracks are also designed to sound natural in a two channel monitoring environment (that is, as L/R stereo).

Additionally, any two channel stereo program that was originally intended to be played out of two monitors but that plays back appropriately in four channels, as a decoded Dolby stereo LCRS, can be designated as Lt/Rt.