The concept of 3D audio is gaining a lot of traction lately, in both commercial and consumer settings. Tom Norton recently wrote about his experience with a system called Imm Sound
, which employs many speakers around and above the audience in commercial cinemas, as does Dolby Atmos and Barco Auro. On the home front, several companies have developed technologies that purport to create 3D soundfields from two speakers or a soundbar, including Gen Audio's Astound Sound and Sonic Emotion's Absolute 3D, both of which have been discussed on the Home Theater Geeks podcast here
Then there's SRS Labs, which has been working on 3D audio perhaps longer than anyone else. Not only does this company offer a variety of proprietary soundfield-expansion algorithms, it is also the founding member of the 3D Audio Alliance (3DAA), which is working on an open-standard specification called Multi-Dimensional Audio, or MDA.