RS SPL Correction scale??? I can't find it..

Discussion in 'Archived Threads 2001-2004' started by Rob Curtis, Jan 4, 2002.

  1. Rob Curtis

    Rob Curtis Stunt Coordinator

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    Can anyone help me find it, or repost it please?

    Thanks
     
  2. ColinM

    ColinM Cinematographer

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    10Hz +20.5
    12.5Hz +16.5
    16Hz +11.5
    20Hz +7.5
    25Hz +5
    31.5Hz +3
    40Hz +2.5
    50Hz +1.5
    63Hz +1.5
    80Hz +1.5
    100Hz +2
    125Hz +0.5
    160Hz -0.5
    200Hz -0.5
    250Hz +0.5
    315Hz -0.5
    400Hz 0
    500Hz -0.5
    630Hz 0
    800Hz 0
    1KHz 0
    1.25Khz 0
    1.6KHz -0.5
    2Khz -1.5
    2.5Khz -1.5
    3.15Khz -1.5
    4KHz -2
    5KHz -2
    6.3KHz -2
    8KHz -2
    10Khz -1
    12.5KHz +0.5
    16KHz 0
    20KHz +1
    [​IMG]
     
  3. Rob Curtis

    Rob Curtis Stunt Coordinator

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    Perfect!!Thank you it's exactly what I was looking for.
     
  4. ColinM

    ColinM Cinematographer

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    [​IMG]
     
  5. Martin Rendall

    Martin Rendall Screenwriter

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  6. Mal P

    Mal P Stunt Coordinator

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    What tone does Video Essentials use for it's calibration?

    Thanks,

    Mal
     
  7. GregoriusM

    GregoriusM Second Unit

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    Warning: Newbie in this area.

    Does this chart compensate for human hearing or is it used for some other reason?

    ... Greg
     
  8. Patrick Sun

    Patrick Sun Moderator
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    It's used for correcting the deficiencies of the mic pickup used in the RS SPL meter at various parts of the audio spectrum.
     
  9. Chuck C

    Chuck C Cinematographer

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    is the provided scale for the digital or analog model or both?
     
  10. Patrick Sun

    Patrick Sun Moderator
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    As a non-precise manner of SPL measuring, the corrections will work for both models.
     
  11. GregoriusM

    GregoriusM Second Unit

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    Thanks, Pat!

    That is totally weird that the meter would have those deficiencies. But I guess we're not paying a huge amount for it.
     
  12. Deane Johnson

    Deane Johnson Supporting Actor

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    I am assuming I have been using those correction factors correctly.

    As an example, if my reading at 25 Hz is showing -5db on the meter scale, my level is actually zero since the meter is insenstive at that frequency by 5db.

    Is this correct?

    Deane
     
  13. ColinM

    ColinM Cinematographer

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    Ten - 4
    [​IMG]
    ( correct)
     
  14. Patrick Sun

    Patrick Sun Moderator
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    BTW, ignore the calibration numbers for anything over 9KHz, there's a big fall-off in mic sensitivity there. (Then again, unless you're testing tweeters, it's not a big deal).
     
  15. Ted Ross

    Ted Ross Second Unit

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    Can anybody answer Mal Ps question? What db adjustment do we need for the test tone on VE with the Rat Shack SPL meter?
     
  16. jeff peterson

    jeff peterson Supporting Actor

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    Ted, the second post in this thread answered the question. If the meter reads what's in the first column, you must add the value in the second to get the actual reading.
     
  17. Ted Ross

    Ted Ross Second Unit

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    Jeff, I am aware of the second post, but I dont know what frequency the test tones are in VE. Jack just answered my question, though. Thanks!
     
  18. Kevin C Brown

    Kevin C Brown Producer

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    I *know* that Avia is set up with the RS meter in mind. No calibration offset adjustments are necessary. I would think that VE is the same way. ??
     
  19. Sonnie Parker

    Sonnie Parker Second Unit

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    Kevin,

    Are you absolutely sure about the corrections being built into AVIA?

    The reason I ask is because I thought I read in one of Guy's post that he didn't use the corrections because he had know way of knowing what everyone would use as measuring devices. Seems like he used ETF and a preamp mic setup himself. I've also read where others are using Spectra Plus and they use the RS mic compensation for monitoring or recording AVIA sweeps.

    I'm very curious about this.

    Thanks,

    SP
     

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