Greetings all,
regarding the calibration, the MiniDSP web site advertises download of a calibration file based on the microphone's serial number. Is the file generated by calibrating the specific microphone, or is the file a generic one, based, e.g., on several samples of microphones?
The other option is CLS, allegedly calibrating each individual microphone.
Any experience?
Kindest regards,
M
regarding the calibration, the MiniDSP web site advertises download of a calibration file based on the microphone's serial number. Is the file generated by calibrating the specific microphone, or is the file a generic one, based, e.g., on several samples of microphones?
The other option is CLS, allegedly calibrating each individual microphone.
Any experience?
Kindest regards,
M
Any reasonable definition of the word "calibration" would mean an individual calibration of each device. So I should think it would be a calibration file unique to the serial number.
I've read somewhere that MiniDSP generates the calibration files based on end-of-line testing of the microphones, so quite sure that the files are unique (I own an UMIK-1, although I don't really use it at the moment).
I once downloaded a couple files around my serial number and plotted the curves in excel, and indeed there are deviations, IIIRC rather small (less than 1dB), but surely not identical. Infos it because I couldn't read the last number of my serial number anymore...
Don't worry, calibration response is almost flat, biggest eq around 15kHz and below 20Hz. Sorry I can't add a graph now, I'm travelling without my laptop.
The mic's sensitivity factor (dbr 1V/Pa @1Khz) is also included in the calibration file.
It might be useful if you are comparing data to another mic or need the absolute pressure level. I quickly sampled a few serial numbers and sensitivity can vary by +/-3dB between mics. Change the sensitivity and the entire corrected FR curve shifts up/down.
Edit : both the sensitivity and correction table is used by REW
It might be useful if you are comparing data to another mic or need the absolute pressure level. I quickly sampled a few serial numbers and sensitivity can vary by +/-3dB between mics. Change the sensitivity and the entire corrected FR curve shifts up/down.
Edit : both the sensitivity and correction table is used by REW
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Greetings all,
thank you very much for the answers, it is assuring that the calibration files are for a specific microphone.
Based on your answers, I will be ordering one now.
Kindest regards,
M
thank you very much for the answers, it is assuring that the calibration files are for a specific microphone.
Based on your answers, I will be ordering one now.
Kindest regards,
M
^ this is exactly why I purchased one.
Even if it's not a great reference above 2kHz, that sensitivity effectively means you've got a much broader-band spl meter - and you can check it against your other mic.s.
BTW, Cross Spectrum is only $31 more for their calibration file (and you've still got the serial number from miniDSP for their calibration file). As to which is the more "correct" calibration file - I don't know, but at least you've got the option for that $31 extra.