Umik-1 and J-BoxII giving different curve above 4kHz

Phil Pope

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Hi

not sure why I am getting different measurements. Umik-1 USB mic is set up with mic calibration file, headphone output goes to mixer and then to power amp. J-box II was set up according to instructions and mic calibration file loaded, aux output connected to mixer and power amp, REW output voltage increased until curves overlaid each other. Checked the mics were both pointing directly at the centre of the horn. Speaker being measured it a large MEH. Mic position is 30cm from the front of horn. Red trace is the Umik-1, Blue is the J-Box. Why do the measurements diverge at high frequency?


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Is the SPL scale accurate?

Regards,
Wayne
 
Probably best attaching an mdat file with the two measurements, that will make it easier to compare them and their respective cal file responses.
 
thanks for looking at this. So the UMik cal file is incorrect? How can you tell it is the Umik cal file rather than the JBox cal file?
 
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