Well, it’s the delay the amp takes to treat the signal, and it should be added to the distance (1ms equals roughly 1 feet). my amp doesn’t have a way to measure it and it has to be added manually.
Anyway, I got an answer from Jack Gilvey over at SVS and he says it’s 6 ms, no matter if you turn the features inside the sub on or off .
It’s roughly that figure in all of their subs. And the sound path transmitter adds an extra 25 ms.
I hope this is useful to someone.