Please help me to understand what would be the best way to soffit mount these monitors?
External image, not preserved — original: http://www.focal-fr.com/catalogue-docs/EN/27/img/moyennes/1069.jpg
In the manual it is said all 4 ways are possible although I see them used as in the photo all the time.
By design the Twin6 Be’s are rather intended for a landcape orientation, though in some situations they could be positioned vertically. As seen in the earlier rear panel description, the Twin6 Be has a switch allowing to choose which drive unit is to reproduce the mid frequencies (see below) (fig. E). Consequently it will always be possible, as desirable, to configure the speakers in a “mirror” (ie symetrical) way (fig. F). As a general rule having the “midrange” driver on the inside of the cabinet results in better imaging.