User manual ELECTRO-VOICE XARRAY FLY

[. . . ] X-ARRAYTM CONCERT SYSTEMS Flying Manual and Structural Ratings X-ArrayTM Loudspeaker Systems RIGGING-SAFETY WARNING This document details general rigging practices appropriate to the sound industry, as they would apply to the rigging of Electro-Voice X-ArrayTM loudspeaker systems. It is intended to familiarize the reader with standard rigging hardware and techniques for suspending X-ArrayTM loudspeaker systems overhead. Only persons with the knowledge of proper hardware and safe rigging techniques should attempt to suspend any sound systems overhead. Prior to suspending any Electro-Voice X-ArrayTM loudspeaker systems overhead, it is essential that the user be familiar with the strength ratings, rigging techniques and special safety considerations outlined in this manual. [. . . ] 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. An Xrss rigging strap is attached at position 1-5 between the ATM grid and the top enclosure, resulting in a relative angle between the grid and enclosure of -3. 6°. (See the sections immediately above for how to calculate the relative angles based on the rigging strap attachment locations. ) Since the grid is level at 0°, the absolute angle of top enclosure is -3. 6° (pointing down). Moving down the array, an Xrsl rigging strap is attached in position 1-2 between the first and second enclosures, resulting in a relative angle of -5. 4° between the two. In other words, the second enclosure is angled down 5. 4° more than the top enclosure, making the absolute angle of the second enclosure -3. 6° -5. 4° = -9. 0°. Finally, an Xrsl rigging strap is attached at position 2-2 between the second and third enclosure, resulting in a relative angle of -7. 2° between the two. In other words, the third enclosure is angled down 7. 2° more than the second enclosure, making the absolute angle of the third enclosure -3. 6° -5. 4°-7. 2° = -16. 2°. Thus, the absolute vertical angle of any enclosure in an array, is the sum of all of the relative angles of the enclosures above. 2. 3 Adjusting Horizontal Angles When using the ATM Fly-WareTM MEGS-4000-T grid, the horizontal shape (the splay angles between array columns) of a loudspeaker array is POSITION 1 - 5 (-3. 6°) Xrss -3. 6° POSITION 1 - 2 (-5. 4°) Xrsl -9. 0° POSITION 2 - 2 (-7. 2°) Xrsl -16. 2° FIGURE 13 - THE RELATIVE ENCLOSURE ANGLES ADD IN A COLUMN page 12 X-ArrayTM Loudspeaker Systems each piece of rigging hardware to determine how much total weight may be suspended. Distributing the majority of the weight of an array column to the rear is desirable because of the higher strength of the grid hinges and linking hinges. If the total weight of a column of loudspeakers is 454 kg (1, 000 lb) or less, the user typically need not be concerned about the weight distribution front to back because the front rigging straps would be capable of supporting the entire weight of the column while maintaining a safety factor in excess of 8:1. If the total weight of a column of loudspeakers is greater than 454 kg (1, 000 lb) ­ but less than the 726-kg (1, 600-lb) maximum ­ the user must be concerned about the weight distribution front to back to ensure that a safety factor of 8:1 is maintained in the front rigging straps. Typically, the most common array configurations used in touring and permanent-installation applications, do distribute the majority of the weight of an array column to the rear. The center of gravity of array columns, such as the one shown in Figure 14a, in which there are no enclosures angled upward and there are no pull ups, is located towards the rear of the column. [. . . ] To remove the knob/locking-pin assembly from the hinge, first unscrew the nut on the knob, then unscrew the knob from the pin. To install a new page 24 assembly, place the spring on the pin, insert the pin into the hinge base and screw the knob on the pin. Check to make sure the spring is under tension, then screw the locking nut on the end of the pin until it is tight against the knob. For repair, use the following kit: Hinge Knob/Locking-Pin Repair Kit: 84982 Electro-Voice, 600 Cecil St. , Buchanan, MI 49107 USA, 616-695-6831 B. [. . . ]