In the golden age of file sharing and DVD ripping, finding a Dual Audio release was considered a "holy grail." It offered versatility. You didn't need to download two separate versions of the season. You could simply switch the audio track in your media player (like VLC or MPC-HC) depending on who was watching.
as Olivia Dunham: A determined agent with a mysterious past. Fringe 1-- Temporada Dual Audio DVD Rip
For many fans, the term "Dual Audio" is the most critical part of the search query. But what exactly does it mean, and why is it so valued? In the golden age of file sharing and