[rolomoto]

I don't understand why the waterfall is showing the decays well into 600ms but the spectogram shows no decays much past 400ms.
Thanks

 

[EarlK]

60 vs 40 (db) range is the difference.

 

[rolomoto]

OK, thanks. I see that now. However, I read that if the readings are under 450ms on the spectogram then bass ringing is under control but the waterfall shows bass ringing not under control.

 

[JohnM]

The stuff at the bottom of the waterfall plot is noise, what we look for in the waterfall plot is peaks in the first slice (at time = 0) that take much longer to reach the noise floor that the rest of the response (like the one at 140 Hz) and how much variation there is in the unsmoothed response below 200 Hz.