D.A.S. Audio Aero 48 - Manual (Page 20)

At this point the boxes are safely stacked.
Finally, the AX-AERO48 grid should be detached from
box number 1.
1.6º
4.8º
3.2º
23
24
In order to set up the angle between boxes 1
and 2 you must pull up (23) from the grid until the hole
in the G2A48 piece fits with the hole that determines
the stacking angle. Then insert the safety pins (24).
47
Aero-48
Manual del usuario/ User´s manual