LAeq Readings puzzle/understanding

[tatster]

Hi all,

I've been experimenting with the LAeq logging at our church, but I'm not sure on some of the readings. This could be my need for better understanding! - or maybe somethings not quite right.

Screenshot and trace file is attached.

Basically, the SPL Meter was running for 40minutes, as was the Logger. At the end of the 40minutes, the large display read 89.8.
However, when saving the Logger trace, the LAeq trace (purple) showed 75.5dB, and interestingly the LAeq1m and LAeq10m also showed 75.dB ?

I was expecting the main reading and the LAeq to be same as I thought that would be the average across the whole trace - is that right?
(Running 5.20 beta1 on Mac OSX with a Mini DSP UMIK-1)

Many thanks,
Anthony

 

[John Mulcahy]

In your screenshot the cursor is at the 10s position on the far left, that is where the 75 dB readings are from. Looks as expected at the end of the trace.

 

[tatster]

Awesome - thank you for the explanation @John Mulcahy. It makes perfect sense now :-)
Amazing software!