The lag is distinctly longer when a listening position includes more or less speakers than the active position.
for example
when I do a sweet spot change with BS TH + BL28 set in narrow to wide it’s nearly instant.
when I change the position from BS TH + BL28 to an position where a set of BL17’s are added there is a few second lag.
my guess is that the BS TH needs to process the soundsignal to split in more channels and needs time to do so…
same when switching from a music position with the BL28 alone and a position with BL28 + BL19 btw