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Dolby SR

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Dolby Spectral Recording, commonly called Dolby SR, is a four channel sound format – left, center, right and surround. It is the most common optical sound format on films made after 1986.

Dolby logo that may appear in the end credits of some films recorded using Dolby SR.

Dolby SR vs. Dolby A

Dolby SR is difficult to distinguish from Dolby A by sight. Here are some tips on telling them apart:

  • Some (but not all) films made after 1986 will have Dolby SR tracks, though A-type was still in use well into the 90s.
  • Some (but not all) films with Dolby SR tracks will display the words "Dolby SR" with the Dolby logo in the end credits
  • Some (but not all) films with Dolby SR tracks will display the words "Dolby SR" on the edges of the film leader.
  • A Dolby SR track played in Dolby A will usually sound fine, but will have more noise than you would expect from a soundtrack with Dolby Noise Reduction.

External Links

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