Cubo 15

Thank you, I have 4 Ev 15 dl 400, to test, the location, front to front, do you need any modification for this?

That depends on the clearance in front of the drivers and the excursion they make. To make sure that the accordion surrounds of the two drivers can not touch each other you might want to use a spacer ring between the drivers. I.e. an 18 mm MDF ring between the drivers doesn't hurt the outcome but might not be needed.