[Bug Report]Sigmastudio Undesired 20kHz high roll off when using the Auto EQ single band.

When using the single channel Auto EQ there is always a high roll off at 20kHz.

Attached an example of a reverse "loudness" curve that is imported in order to create a loudness curve. The filter number is set at 2, since that should be enough for a low and high selve. The curved is reasonably matched, but there is always a undesired high roll off. When the checkbox "Include Crossover In Equalized Curve" is enabled, it is also visible id the Auto EQ GUI.

The issue is, there should be no crossover with the single band Auto EQ. When using the two way crossover it is possible to disable the crossover filter and then the filter curve is as desired, thus without the high roll off. But then you using to many resources resources if only a single band EQ is needed. Further the Phase compensation is missing with the two way auto crossover.

It seems that the single band Auto EQ is a stripped down version of the crossover versions and that the low part of the two way crossover is used and the default high roll of at 20kHz is still present and not removed.

A screenshot of a very simple project showing the issue. Just a stimulus -> Auto EQ -> Probe The Auto EQ is flat, no filter set and still in the probe the issue is visible and also the phase jump is a clear indication that something is happening.

More screenshots discussing this issue can be found at:

https://ez.analog.com/audio/f/q-a/101340/automatic-eq-sigma-studio/332990#332990

It would be nice if this undesired high roll off of the Auto EQ is fixed, since then it would allow to instantiate only the resources needed and it it possible to use the phase correction, that is missing from the two and three way crossover version of the Auto EQ.

problem

sigmastudio

frequency

crossover

eq