User manual ELECTRO-VOICE A15 DATASHEET

[. . . ] The rigging techniques and practices recommended in this manual are, of necessity, in general terms to accommodate the many variations in loudspeaker arrays and rigging configurations. As such, the user is expressly responsible for the safety of all specific X-ArrayTM loudspeaker-array designs and rigging configurations as implemented in practice. All of the general rigging material contained in this manual is based on the best available engineering information concerning materials and practices, as commonly recognized in the United States, and is believed to be accurate at the time of the original printing. As such, the information may not be directly applicable in other countries. [. . . ] Using the Xrss (short wire-rope rigging strap) Between Enclosures: The short Xrss rigging straps may also be used between enclosures; however, the Xrss offers a lesser range of downward angles than the long Xrsl rigging strap. The short Xrss rigging straps allow a range of angles between the enclosures of 0° (enclosures are parallel) to 10. 8° down in 1. 8° increments. The Xrss rigging strap is 101. 6 mm (4. 0 in. ) shorter than the Xrsl strap. Therefore, for the same angle, there will be four more holes showing when the short Xrss rigging strap is used compared to the long Xrsl strap. This results in an additional 7. 2° upward angle when the short Xrss is used. Thus, the equation for the Xrss becomes: page 11 X-ArrayTM Loudspeaker Systems angles between enclosures also applies to the Xrss when determining angles between the top enclosure and the ATM grid: Angle = 7. 2°- (Holes Showing) x 1. 8°for the Xrss where negative ("-") angles indicate downward angles and positive ("+") angles indicate upward angles. For example, when the short Xrss straps are used between the ATM grid and the top enclosure for 0° relative angle between the two (position "0-4"), there are 4 holes showing as illustrated in Figure 12b. This means that the formula for the short Xrss strap must be offset by 4 compared to the long Xrsl strap; or in this example, 7. 2° (4 x 1. 8°) = 0°. If the fittings on the Xrss short straps are inserted into track cutout #1 on the grid and track cutout #0 on the top enclosure (position "1-0"), as shown in Figure 12c, one hole is showing and the top enclosure is angled 7. 2° (1 x 1. 8°) = +5. 4° upward relative to the grid. Multiple Enclosure Angles: The relative vertical angle between the grid and the top enclosure or between adjacent enclosures is determined by the attachment position of the Xrss and Xrsl rigging straps in the rigging track in the grid and enclosures. Note that the straps set the relative angles between grid and enclosures, and that those relative angles are cumulative when determining the absolute angle of the enclosures lower in the array. The reader should note that the rating examples given above are valid for when the rigging hinges and straps are loaded at nearly 0° vertically. The reader is cautioned that the strength ratings of the rigging hardware varies with angle, and should consult section 3. Rigging-Strength Ratings, Safety Factors and Special Considerations for a page 13 easily set by coupling the grids together. The ATM grid and couplers are shown in Figures 8e and 8f. The splay angle between array columns is determined by the position of the couplers within the grids front and rear bars, which is illustrated in Figure 8g. The front and rear couplers may be swapped to attain small or 0° splay angles, as shown in Figure 8h. 2. 4 Load Distribution Front to Back Array Load Distribution: Within the X-ArrayTM flying system, the ratio of the total load supported by the rear hinges versus the front straps is important, because the front rigging straps have a lower working-load limit then the rear rigging hinges. The ratio of the total load supported by the front versus the rear rigging hardware is dependent on the location of the center of gravity of the assembly of enclosures in an array column. Two grid hinges are capable of supporting the entire load of an array column weighing 726 kg (1, 600 lb) while maintaining a safety factor of 8:1 with no contribution from the front straps. Two front rigging straps are capable of supporting the entire load of an array column weighing 454 kg (1, 000 lb) while maintaining a safety factor of 8:1 with no contribution from the rear hinges. It is possible that some array shapes will transfer most or all of the weight of a column to the front or to the rear rigging hardware, therefore it is not valid to assume that the total weight will be distributed evenly over all four attachment points and to simply add up the individual working-load limits of X-ArrayTM Loudspeaker Systems detailed discussion of the structural strength of the rigging hardware. [. . . ] Enclosure Alignment-Foot Replacement: Each foot is installed with four wood screws. If a screw hole strips out during installation, rotate the foot and reinstall the screws. The following service parts are available: Male Alignment Feet: Female Alignment Feet: 28333 28334 Alignment-Foot Screw: 63088-CP Electro-Voice, 600 Cecil St. , Buchanan, MI 49107 USA, 616-695-6831 Rigging Hinge Service: The hinge knob/lockingpin assembly on the Xrhl, Xrhg or Xrhp may be repaired with the hinge knob/locking-pin repair kit. To remove the knob/locking-pin assembly from the hinge, first unscrew the nut on the knob, then unscrew the knob from the pin. [. . . ]