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Comments
@tja Pro Q and the Mani EQ are linear phase, so I wouldn't expect any aliasing. Non-linear filters (those that add wanted distortions and non-linearities such as "drive" etc) are the kind of filters that will have aliasing problems.
So for example a fairer comparison would be FabFilter Volcano, rather than Pro Q3.
This type of aliasing is produced by a digital saturator. I am not familiar with this plugin, but that could either be a saturator that is included in the plugin but not part of the filter itself, or it could be a saturator in the feedback loop of the filter itself. Adding saturation to soft-clip the resonance of the filter is a good way to make it sound more like an analog filter sounds when you set the resonance up high. The aliasing shown in the picture above appears to be very well handled with oversampling and therefore it should be totally inaudible. As usual, it looks like Toneboosters designed this plugin carefully and skillfully.
This type of filter has no saturation so it doesn’t produce any aliasing at all. The same is true of our own parametric EQ and most other EQ plugins that don’t explicitly mention saturation. This type of filter will not alias, regardless of whether it’s well designed or not.
I did. Is there anything specific you wanted to call to my attention there?
About the fab-filter high-cut vs our high-cut: we use a simpler filter design that always cuts down to zero at a frequency of sampleRate/2. Because it goes to zero at the top, the filter curve gets squashed when you put the cutoff frequency up high. FabFilter uses a more complicated design that maintains its shape more consistently across every cutoff frequency.
If you use the "high quality" switch at the bottom of the Volcano UI the aliasing will likely disappear:
https://www.fabfilter.com/help/volcano/using/inputoutput
Or lower the 'Drive' which is used to saturate the signal causing aliasing
Also there's various models for each filter type with different level of saturation/distortion.
As long as everything sounds good I don't really care if there's aliasing or not
In your FabFilter pro-q screenshot it looks like you are using a high cut filter with a 48 db/octave drop above the cutoff frequency. Our high cut filter is only 12db/octave. If you set the FabFilter one down to 12 db then the two will be closer.
Klevgrand apps oh my! Sine sweep at -18Dbfs RMS, factory presets
Klevgrand Spinn
Klevgrand Stark
Their mastering app also brings aliasing into the mix
The best distortion on iOS (because of 16x oversampling)