Calibrating SSL2+ and Presonus PRM1

[santiagoabelleira]

Hi all, I am trying to calibrate my sound card to make some measurements but I am not sure if the result is correct.

I am connecting the out to the in and cranking the monitor level until -12dBFS however I am not very convinced with the curve obtained, it seems pretty whacked. I have also attached the measurement file, any help would be greatly appreciated.

 

[John Mulcahy]

Monitoring is active so the input is being mixed back to the output. The output has to be only the signal from REW.