Dayton Audio calibration files

[Slartibartfast]

I am confused by the contents of Dayton Audio calibration files. I have seen a couple of statements by Dayton Audio tech support saying that the gain values in the calibration files are to be added to the measured response to obtain the corrected response. I have always understood that calibration values should be subtracted not added so who is right, Dayton Audio tech support or the rest of the internet? I know REW definitely subtracts cal files. 

[Adam]

Bro: Adding a negative number is a subtraction.

The cal files include negative numbers.

[Niall Gray]

Cal files include both negative and positive gains. The point is that the calibration values should be subtracted from any measurement and if you select calibration in AudioTool you can see the calibration curve is inverted. But Dayton Audio say the opposite.

"Within the calibration file if there is a negative that proceeds the offset value. (I.E. -2.3dB) then it would be a negative adjustment to bring the microphone in-line with the reference value at 1kHz. If there is no negative present prior to the offset figure it would be a positive adjustment. The calibration files are essentially a filter curve to an extent to align the microphone to a zero point."

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[Slartibartfast]

Cal files include both negative and positive gains. The point is that the calibration values should be subtracted from any measurement and if you select calibration in AudioTool you can see the calibration curve is inverted. But Dayton Audio say the opposite.
"Within the calibration file if there is a negative that proceeds the offset value. (I.E. -2.3dB) then it would be a negative adjustment to bring the microphone in-line with the reference value at 1kHz. If there is no negative present prior to the offset figure it would be a positive adjustment. The calibration files are essentially a filter curve to an extent to align the microphone to a zero point."

[Julian Bunn]

As an example, if the Dayton cal file shows a value +1dB at 500Hz, then without applying any calibration, the measured response at 500Hz from the mic would be 1dB too high. So, AudioTool applies the calibration by subtracting 1dB from the measured response at 500Hz.

Hope that helps?

Julian

[Slartibartfast]

That is exactly how I understood it worked but Dayton Audio tech support seems to think the opposite. That is where the confusion came from. Thanks for clearing it up 👍