Creating subsonic filter in "generate XO".

[Dahlberg]

I'm thinking that it would be a good idea to create the subsonic filter in the "generate XO" instead of doing it in the
filter creation process after the time alignment is already done.

The two different XO's. The one with the subfilter is basically a 4-way filter resaved as a 3-way filter (XO4L+R deleted).


The peak amplitude time difference between the two xo's is ~140 samples.

[UliBru]

The subsonic filter is applied to the overall correction as a minphase filter to avoid a subsonic preringing.
It is used in macro4 because it does not influence the correction algorithms in this stage.

[Dahlberg]

So you say that the macro4 process will give a better result when compared to creating a linear phase subsonic filter time corrected for the "latency" introduced by the added XO position ?

[UliBru]

Yes. In the past I have used the subsonic directly in the target designer. But then macro3 and 4 algorithms are influencing the result.
So I have decided to use the subsonic in the last stage. You may think about it as using a minphase filter on a corrected system. Of course such a filter will have its group delay. But this is natural. A linearphase subsonic behaviour will introduce non-causal pre-ringing.

[Dahlberg]

OK, thank you