JBL VRX900 - Manual (Page 21)

Ground-Stacked, Upward Firing Arrays
Applications such as covering stadium bleachers from the playing field may be addressed
by installing the VRX932LA-AF/ VRX-AF/ VRX-SMAF array frame to the bottom of the array.
Up to four VRX932LA/VRX928LA loudspeakers may be locked
together and ground stacked using the VRX array frame kit, as shown.
[Warning: Do not ground stack more than four
VRX932LA/VRX928LA loudspeakers in one array].
When ground stacking VRX900LA loudspeakers, use the
VRX932LA-AF/ VRX-AF/ VRX-SMAF array frame as the base (as shown)
by attaching the loose drop levers, included in the array frame kit, to the
lower rigging bar on the VRX900LA loudspeaker. When stacking the
loudspeakers together, make sure each loudspeaker is locked together.
Be certain that the surface on which the system is to be stacked is flat,
stable and solid.
Suspension in Permanent Installations
For permanent installation applications a VRX array may be suspended using M10 eyebolts. Only
load-rated, forged shoulder eyebolts are to be used. A kit consisting of three (3) forged shoulder eyebolts
is available from JBL Professional as part number 229-00009-01. Suspension of the VRX array must employ
both top attachment points. The VRX918S and VRX915S subwoofers must always be at the top of the array.
Eyebolt Suspension
The following table defines the maximum number of speakers that may be suspended using the two M10
eyebolt attachment points provided on the cabinets. A minimum design factor of 7:1 is maintained for all speak-
er configurations at or below those indicated in the table.
Eyebolt Suspension Array Frame Suspension
Maximum number of VRX918S in array
Maximum number of VRX932LA in array
5 4 3 2 1 0
0 2 4 5 6 6
21
Maximum number of VRX928LA in array
Maximum number of VRX915S in array 4 3 2 2 2 0
0 2 3 4 5 6