UMIK-1 SPL Reading at 90db in 'Slient" Room

[kmartinka]

Hello,

I am new to the forum and I am trying to get my new UMIK-1 to work properly. I am having a problem with the SPL meter function reading ~90db in a silent room. See attached picture.

I am using REW V.5.19 and I have entered my cal file from miniDSP. Please see attached cal file.

Is my mic defective or did I do something wrong.

 

[goginux]

try calibration file,
Unique Calibration File Download

All UMIK-1 are calibrated with a unique calibration file. In addition, a unique auto-generated 90-degree calibration file for use with surround system applications. To download the calibration files, look for the 7 digit Serial Number found on the body of the microphone.

1. Enter the serial number in the form below (three digits then four digits e.g. 700-XXXX).
2. Your calibration files will automatically download in most browsers. If not, click on the links provided to manually download

minidsp page

 

[kmartinka]

Thanks for the reply. I have the calibration files from miniDSP and one is loaded in REW. I posted the calibration file in my first entry.

So I am not sure why the microphone reports ~90db in a slient room with REW.

 

[DanDan]

Faulty Mic perhaps. Can you run REW with another mic, even an onboard laptop or anything.

 

[jtalden]

Try removing the quotes on the sensitivity entry in the cal file.

 

[tobiasga]

I am having the exact same problem.. tried removing the quotes around the line with sensitivity.. didn't help in my case.

 

[kmartinka]

I do not have another mic to test with on this PC but I do have another laptop I can try in a bit.

Removing the quotes in the cal file did not work as well.

I have tried both 32 and 64 bit flavors of REW 5.19 and had the same results. I also tried REW 5.20 RC5 with same result.

I have made a support ticket with miniDSP and waiting to see what they have to say.

I am thinking of trying a UMIK-2(if I can get it) and see if it does the same result.

 

[tobiasga]

It seems like your sensitivity factor (-40.06dB) is also very low like mine (-39.88dB). I have made a support ticket at miniDSP too - let's share any replies we get here?

 

[tobiasga]

They replied back to me and the calibration file was wrong. They made a new one with a fixed sensitivity factor. Probably the same happened with yours.

 

[kmartinka]

I also received an email from miniDSP indicating the calibration file has been fixed. This resolved my issue.

Thanks to all who tried to help.

 

[astolfo]

Can you post what they changed? before/after?
thank you
Astolfo

 

[goginux]

I have 4 microphones, umik-1 is calibrated by cross spectrum labs, dayton audio factory, sonarworks also factory, audysey is calibrated by me. at umik-1 i have never used factory calibration. here example with measurements from different microphones.