Electro-Voice X-Line Very Compact (XLVC) manual Structural Rating Overview

3.2 Structural Rating Overview

For the XLVC loudspeaker enclosures there are two independent strength ratings that, together, give a complete description of the overall structural capabilities of any loudspeaker system; which are:

1.The strength of each individual enclosure rigging point; which is the combined strength of the rigging tube and channel, hinge bars, swing arms, quick-release pins, bolts and enclosure.

2.The total strength of the overall grid; which is a function of the combined forces from all of the rigging points acting on the rigging components and the grid as a whole.

For the XLVC grids, there are also two independent strength ratings that, together, give a complete description of the overall structural capabilities of the grid; which are:

1.The strength of each individual grid rigging point; which is the combined strength of the rigging tube and channel, hinge bars, swing arms, quick-release pins, bolts, sidearms and spreader bars.

2.The total strength of the overall grid; which is a function of the combined forces from all of the rigging points acting on the rigging components and the grid as a whole.

For the CBEAM coupler beam / extender beam, there are also two independent strength ratings that, together, give a complete description of the overall structural capabilities of the beam; which are:

1.The strength of each individual beam rigging point; which is the combined strength of the U channels, yokes, quick-release pins, bolts and chain-link rings.

2.The total strength of the overall beam; which is a function of the combined forces from all of the rigging points acting on the rigging components and the beam as a whole.

WHEN SUSPENDING ANY XLVC LOUDSPEAKER ARRAY OVERHEAD, THE WORKING-LOAD LIMIT MUST NEVER BE EXCEEDED FOR THE INDIVIDUAL ENCLOSURE RIGGING POINT, FOR THE OVERALL ENCLOSURE, OR FOR ANY OF THE RIGGING ACCESSORIES.

In an XLVC system, the forces acting on each loudspeaker system (on each individual rigging point and on the overall enclosure) and the forces acting on each rigging accessory (grid, coupler beam, extender beam, etc.) will vary with each array configuration. Determining the forces throughout an array requires complex mathematical calculations. Electro-Voice engineers have, however, defined a set of simplified structural-rating guidelines that eliminate the need for the complex calculations for most array configurations. The interaction of the complex forces through- out arrays were analyzed to develop this set of conservative guide-lines, presented below, to enable a rigger to immediately determine on site whether or not an array is safe without having to make weight-distribution calculations. The structural-strength ratings of the individual rigging points and the overall XLVC enclosures are also presented below so that a complex structural analysis can be made for any array configuration. The reader should consult an experienced structural engineer to perform the complex structural analysis.

ELECTRO-VOICE®X-Line Very CompactTM Rigging Manual 36