UMIK-1 sensitivity

[Wei Lin]

Hi,

I would like to use UMIK-1 to measure SPL with my Python code, but I can not find the sensitivity of UMIK-1, nor in its datasheet of its calibration file.

In its calibration file there is one line saying "Sens Factor =-0.667dB", but it doesn't make sense to me.

I wonder how REW calculates the sensitivity of UMIK-1 from "Sens Factor" ?

Thanks

Wei

 

[John Mulcahy]

The sens factor figure is the rms input level from the mic in dBFS when driven by a 94 dB calibrator with the mic input volume set to maximum. Note for that purpose the dBFS reading is based on a full scale sine being -3.01 dBFS, not 0 dBFS. The actual OS input volume gain/attenuation needs to be accounted for when converting mic rms dBFS levels to SPL.

 

[cadillacfella]

The sens factor figure is the rms input level from the mic in dBFS when driven by a 94 dB calibrator with the mic input volume set to maximum. Note for that purpose the dBFS reading is based on a full scale sine being -3.01 dBFS, not 0 dBFS. The actual OS input volume gain/attenuation needs to be accounted for when converting mic rms dBFS levels to SPL.

I have a Dayton Audio Omnimic V2. REW sees there is a cal file, but tells me the mic is not recognized and will not load the sens factor. Any thoughts on what to do?

 

[John Mulcahy]

REW would usually recognise an Omnimic, assuming you have selected it as the input device in your REW soundcard preferences. How are your soundcard preferences set up? Maybe post a screenshot.