From reading a little about the new Gina system it seems that it comprises: the Gina mains, multiple subs and a Sound Generator (SG). I’m familiar with the multiple subs approach and so it’s the SG that intrigues me. ( I assume it is the source of the second stream that you refer to in the other threads.) In particular I’m wondering whether it would work with other mains speakers? If so, how difficult would it be to calibrate the SG so that it would appropriately complement the mains? I’m assuming here that the mains would not be dipoles.