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Deliberately checking C-weighting makes it droop even further with falling frequency
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C-Weight check box has no effect within the start and stop limits of the calibration file.
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Green and mustard are my two RS meters old and new using the new cal file for old meters.
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I don't understand what you're attempting to do here, since I don't know the model numbers or names of the calibration files you're referring to.
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I have a 3dB calibration difference between the two meters on pink noise
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The calibration files are basically normalized at 1000Hz, with no appreciable difference above 80Hz. Overall gain differences are accounted for in the calibration of REW.
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Any useful thoughts please?
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If I understand correctly, your problem is that you feel your RadioShack meters don't track the Galaxy meter at low frequencies? If that's what you're saying, then I wouldn't be surprised. The calibration files are for Sonnies meters against his ECM8000. Since he tested each of the Galaxies against each other and they were very consistent, then I would think the Galaxy calibration file would likely be considered accurate for most Galaxy meters. As for the RadioShack meters - it's a crap shoot. Why do you continue to use them when you have a Galaxy?
brucek