Extended surround sound is nothing new. The staple surround sound configuration for movie theaters and home theaters is digitally delivered, discrete 5.1-channel surround sound. But in both arenas there have also been numerous pushes to move beyond that paradigm. In the DVD era we were given a number of options for expanding our surround sound experience toward the back of the room, from the base 5.1-channel paradigm to 6.1- and 7.1-channels. Although only select DVD titles were encoded with extended surround, within a few years virtually every AV receiver and surround processor in existence offered tool sets that would decode these soundtracks- or any 5.1-channel soundtrack- to 6.1- or 7.1-channels on playback. And just about any AVR you look at today will include seven channels of amplification.