Question about Speaker Distance settings

Discussion in 'Archived Threads 2001-2004' started by Richard Burzynski, Mar 28, 2002.

  1. Richard Burzynski

    Richard Burzynski Second Unit

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    My friend has a Sony DD decoder. He wants to set his speaker delays appropriately, but he has a question. The settings are in milliseconds (m.s.), and the owner's manual doesn't provide the corresponding m.s./ft conversion.

    Is there a standard rule of thumb?

    Thanks.

    Rich B.
     
  2. David Judah

    David Judah Screenwriter

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    1 ms/ft. is the usual convention. I think it is actually closer to 1ms/1.3ft though.

    DJ
     
  3. Richard Burzynski

    Richard Burzynski Second Unit

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    Thanks David.
     
  4. John Kotches

    John Kotches Cinematographer

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    The standard quoted value of speed of sound in the atmosphere is 1120ft/sec, or 1.12 ft per millisecond.

    Since this value varies with atmostpheric pressure, humidity and temperature it's just an estimate/guideline.

    Regards,
     

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