the guys told me that center boundary is there so you can setup the center independently- but lets face it- we now know we can setup each speaker independently anyway so its not really needed but I do run it as center boundary. So in my case the corner speakers are setup to corner and the others are setup as boundary/ wall. I never investigated sub either.

best regards,
Jerry

Best regards,
Jerry
Main System: 861v6, DSP8000s in corners, DSP7000s Center and Sides, 1-9 humans.