Thank you. I was also thinking that maybe I could exclude LF and RF speakers from the ART duties, and Bacch could use them undisturbed, say in 5.2 setup.You can control the filters for each.
BACCH's default XTC filter for LF is ~90Hz. And then you can adjust as necessary to make sure that ART and BACCH don't overlap.
XTC is not effective at LF anyway.