Radio Shack Correction Values - More

Discussion in 'Archived Threads 2001-2004' started by Jon M, Jan 7, 2002.

  1. Jon M

    Jon M Agent

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    I have a question about the correction values. How do you determine correction values for frequencies between the ones listed. Is a best guess close enough? Also, with a program like ETF, does the mic correction file correct the response only at the specified frequencies, or does it compensate over the entire range?
     
  2. BruceD

    BruceD Screenwriter

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    Were you able to construct a microphone calibration file for ETF from the format I gave you?
    I'm not sure I would worry about values in-between, just let ETF use the corrected values as given. The RS SPL meter is not a calibrated mic and not all RS meters will necessarily match this correction file. If you want more accuracy you will need to buy or build a calibrated mic/pre-amp setup.
    For more info on building go here:
    mic & preamp
    BruceD
     
  3. Jon M

    Jon M Agent

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    No, I have not been able to get it to work yet. I created a file which looks exactly like this:

    Radio Shack Low Frequency Correction File for ETF

    10.00020.0000.000

    12.50016.5000.000

    16.00011.5000.000

    20.0007.5000.000

    25.0005.0000.000

    31.5003.0000.000

    40.0002.5000.000

    50.0001.5000.000

    63.0001.5000.000

    80.0001.5000.000

    100.0002.0000.000

    125.0000.5000.000

    160.000-0.5000.000

    200.000-0.5000.000

    250.0000.5000.000

    315.000-0.5000.000

    400.0000.0000.000

    The measurements did not look any different with and without the file. Any ideas? I am going to write up a step by step process to use the Feedback Destroyer and ETF after I get this final step. I did get the sub to measure very well though, factoring in the correction values by eye.
     
  4. BruceD

    BruceD Screenwriter

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    Did you buy ETF5 or are you using the free download?

    BruceD
     
  5. Kevin C Brown

    Kevin C Brown Producer

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    I just interpolate at the pts I need in between the known measurements. If you graph it, it is a pretty well behaved curve.
     
  6. Jon M

    Jon M Agent

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    I am using the demo version. Does this make a difference? I didn't think that the demo eliminated the mic compensation does it?
     
  7. BruceD

    BruceD Screenwriter

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    Jon,

    I don't know about the latest revisions, as I tried and bought the software when it was at ETF4 back in 1999 or 2000. At that time the free download didn't allow mic compensation files to be loaded.

    BruceD
     

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