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LAeq REW/UMIK vs Cls 1 - calibration THAT WRONG? 1 year 7 months ago #47951

  • andreasroessler
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- connected a new UMIK-1 with REW on Linux with correct calibration file (705-6904)
- comparing the LAeq AF with a calibrated Class 1 (Cirrus Research CR 171)
- the difference is always more than 5 dB, sometimes 20 dB


- what's wrong?
- are my expectations too high?
- how can I re-calibrate? I have an 94 dB calibrator

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LAeq REW/UMIK vs Cls 1 - calibration THAT WRONG? 1 year 6 months ago #48012

  • john.reekie
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You could use the calibration function in REW, click on the SPL Meter button.
I'm wondering though whether you got the dialog popup in REW asking whether to use the UMIK-1 calibration. That's necessary for the SPL adjustment to work.
I am not miniDSP support.

"You must ask the right questions." - Dr. Alfred Lanning's hologram.
-> Have you read the User Manual??
-> Have you drawn and posted a diagram?
-> Have you posted a screenshot?
-> Have you posted your config file?

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LAeq REW/UMIK vs Cls 1 - calibration THAT WRONG? 1 year 6 months ago #48016

  • Ultrasonic
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Are you measuring at exactly the same position and using the same weighting?

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LAeq REW/UMIK vs Cls 1 - calibration THAT WRONG? 1 year 6 months ago #48033

  • andreasroessler
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Yes, I'm using the downloaded calibration file.

Meanwhile I adjudsted the "Sens Factor" in the file and getting close enough.

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LAeq REW/UMIK vs Cls 1 - calibration THAT WRONG? 1 year 6 months ago #48034

  • andreasroessler
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Maybe the position was not near enough. The weighting was the same.

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