Can anyone please tell me what am I seeing here?
Looks like Frequency (and all other stock EQ’s) adds some kind of noise to the signal. Here is the test
Sine wave at -6db goes into three EQs each at the time
APQualizir 2, Fabfilter Pro-Q2 and Frequency.
Every eq has +24db boost at 520hz
Please, have a look at the spectrum analyzer. what kind of noise is that? Only Frequency and all stock Cubase EQ’s has this artifact, no matter what settings I use it always has that noise when boosting.
Also here is interesting video demonstration where you can see how this noise behave when moving EQ band around:
and here are screenshots: