This was interesting. Stereo wideners (a switch made to cause music to sound wider in audio 3D space) work very similar to the Dolby3D, except with equalizatio

This was interesting. Stereo wideners (a switch made to cause music to sound wider in audio 3D space) work very similar to the Dolby3D, except with equalization instead of colour filtering. Dolby3d takes chunks of red, green and blue, and filters them so the left and right eye are seeing slightly different reds, greens and blues in a way that isn't easily detected by the person viewing them. Both eyes see apparently normal views, but together they see a stereo image. Stereo audio wideners take a set of audio frequencies, lowering their EQ on one side while raising them an equivalent amount on the other, so that the left and right ears are hearing different equalization that still sound reasonably normal. It makes sense that Dolby is the primary name associated to both technologies. They are pretty much the same left-right reversed comb filters, except light frequencies versus sound frequencies.