Different results between regular and soundcard calibration routine

[JR Electroacoustics]

Hi All,

I was trying to calibrating my soundcard today and wasn't able to get rid of some low frequency ripple. I noticed this ripple is only present via the regular measurement routine in the main UI, and not via the soundcard calibration routing via preferences. Because of this the ripple won't calibrate out.
I made sure everything was identical in all measurements, and the measurements were done in short succession.

Settings during the regular routine:

Settings during the calibration routine:

Results:

Does anyone have an idea of what I am missing, or could it be a bug?

FYI: I am measuring the specifications of some electronics, this is why such seemlingly small deviations matter to me.

Kind regards,

Jeroen Roth

 

[John Mulcahy]

Make the right IR window longer, that should deal with it. If you adjust it by dragging the icon at the top of the Impulse graph you'll get a preview of the effect on the response. You can change the default in the Analysis preferences.