User manual ELECTRO-VOICE X-LINE RIGGING

[. . . ] X-Line Rigging Manual ELECTRO-VOICE® X-Line TM Rigging Manual Table of Contents Rigging-Safety Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1 X-Line Rigging System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1. 1 Overview of the X-Line Flying System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] When acoustic coverage is required immediately below the array, a single Xfil1 or Xfil2 downfill enclosure can be added at the very bottom of the array. (Acoustic design techniques are outside the scope of this document and the reader is directed to the X-Line modeling software available from the Electro-Voice website for acoustic design assistance. ) It is also possible to construct subwoofer line arrays using the Xsub systems. From Figure 2, the reader will note that X-Line full-range systems are not symmetrical left to right. When constructing a line-array column, it is essential that all Xvls, Xvlt, Xfil1 and Xfil2 enclosures are hung so that the high-frequency sections are all in a vertical straight line. In a stereo sound reinforcement application, the best results are achieved when the boxes in the left and right arrays are oriented so that the high-frequency sections are onstage (i. e. , together towards the middle of the venue), making the left and right arrays a perfect mirror image. This requires that the Xvls and Xvlt loudspeaker systems on the house-right side be turned upside down. The grilles on the Xvls and Xvlt boxes on the house-right side array should be rotated so a consistent appearance is maintained between the left and right sides. Because the downfill boxes cannot be turned upside down, the Xfil1 and Xfil2 loudspeaker systems have been designed as a mirror image pair. Thus, in a stereo system, the Xfil1 would be used at the bottom of the house-left side array, while the Xfil2 would be used on bottom of the house-right side array. 2. 2 Adjusting the Vertical Angles of the Enclosures The vertical angle of an enclosure may be adjusted relative to the enclosure immediately above by choosing different attachment locations for the front linking straps in the enclosure track. The locating holes in the enclosure rigging track are spaced 1. 00 inch (25. 4 mm) apart. Moving the attachment position one hole results in a 2° change in the enclosure vertical angle. Each triple-stud fitting on the Xvsg, Xvsl and Xvsd front straps is attached to the chain with a pin that passes through a hole on the fitting and through the last link on the end of the chain. Note that there are two holes on each fitting that are labeled A and B. These two holes offer two attachment points that change the length of the linking strap assembly. 19 ELECTRO-VOICE® TM Rigging Manual X-Line The rigging straps are shipped from the factory with chain connected in the A position on the fittings on both ends. (This would be denoted as an A-A length. ) When the chain is connected in the B position on both fittings (known as the B-B length), the strap is 0. 50 inches longer than when connected in the A-A position. When the chain is connected in the A position on one fitting and the B position on the other fitting (known as the A-B length), the strap is 0. 25 inches longer than when connected in the A-A position. This 0. 25-inch change in length results in a 0. 5°-angle adjustment. Thus, by adjusting the length of the straps and selecting their attachment position on the enclosure front track, the relative angles between boxes can be adjusted in 0. 5° increments. When used with the A-A length, even-numbered angles result (0°, 2°, 4°, 6°, etc. ) when changing the attachment position of the strap along the track, while odd-numbered angles result (1°, 3°, 5°, 7°, etc. ) when used with the B-B length. With A-B length, in between angles are achievable (0. 5°, 2. 5°, 4. 5°, etc. ). When planning angle adjustments between boxes, the shape of the enclosure must be taken into account. [. . . ] Broken welds, corrosion, missing or damaged components that could reduce the hoist strength. Never exceed the limitations or maximum recommended load specified by the hoist manufacturer. Always follow manufacturers recommendations for operation, inspection, and certification. Always raise and lower the load slowly and evenly, avoiding any rapid changes in speed or shifting loads that could result in a sudden jolt to the suspended system. 39 ELECTRO-VOICE® X-Line TM Rigging Manual Building, Tower or Scaffold Supports: Prior to each use, the strength and load-bearing capabilities of the building, tower or scaffold structural supports should be evaluated and certified by a professional engineer as being adequate for supporting the intended rigging system (including the loudspeakers, grids, chain hoists and all associated hardware). [. . . ]