D.A.S. Audio LX-218R - Manual (Page 14)

Once the first box has been placed at 0º
and raised approximately 75cm (30 in) the second
box of the array can be placed nearby. Once
located in position, the G2A48 guides of the
second box should be freed and inserted in the
rear located receiving points of the suspended box
and secured with the safety pins.
Once the splay angle between the first
two boxes has been determined, the front of the
box can be lifted into place. Three people will be
needed to undertake this operation, two to lift the
box and one to fit the G1A50 guide and safety
pins into the upper box.
8 Manual del Usuario / aero 50, LX-218 LX-218R / & User’s Manual