EVA Series User Manual EVA-2082S/906 EVA-2082S/920 EVA-2082S/126 EVA-2082S/1220 EVA-1151D EVA-2151D Electro-Voice EVA Series User Manual
Table of Contents Rigging-Safety Warning.....................................................................................................................................................3 1.0 Introduction...................................................................................................................................................................4 2.0 Tool List ..............................................................................................................................
Rigging-Safety Warning This document details general rigging practices appropriate to the entertainment industry, as they would apply to the rigging of Electro-Voice EVA loudspeaker systems. It is intended to familiarize the reader with standard rigging hardware and techniques for suspending EVA loudspeaker systems overhead. Only persons with the knowledge of proper hardware and safe rigging techniques should attempt to suspend any sound systems overhead.
1.0 Introduction The Electro-Voice EVA (Expandable Vertical Array) loudspeaker systems or line-array modules represent an important step in line-array technology for small- and medium-scale fixed-installation sound reinforcement. The various models are designed to significantly simplify the physical assembly of a line array. Also, arrays of EVA full-range modules are designed to be powered from one amplifier channel, the necessary crossover and EQ functions accomplished with sophisticated passive networks.
1.0 Introduction (cont’) EVA-2082S/1220: two-way, LF/HF line-array module with a 120° horizontal x 20° vertical coverage pattern (for short throws) and passive crossover/HF-shading/EQ network. The enclosure is trapezoidal in the vertical plane with a 20° total included angle. The two line-array elements contained in the module are vertically splayed by 10°. EVA-AM: this optional attenuation module mounts on the inside of an EVA-2082S input panel, and attenuates the entire module by 3, 6 or 9 dB.
1.0 Introduction (cont’) EVA-SG2-BLK and EVA-SG2-WHT: standard grids for typical down angles with small arrays, or top and bottom suspension for extreme down angles in large arrays of EVA-1151D subwoofer and/or EVA2082S full-range modules. NOT FOR USE WITH EVA-2151D subwoofer. EVA-EG2-BLK and EVA-EG2-WHT: extended grids for extreme down angles in small to medium arrays and typical down angles in large arrays. This is the only grid for flying EVA-2151D subwoofers.
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2.0 Tool List Listed below are the tools required to assemble an EVA array: 1. 2. 3. Phillips #2 screwdriver (for attaching cosmetic end panels). 6-mm Allen (hex) wrench (for attaching tie plates and assembling grids). 3/16-inch flat-blade screwdriver (for attaching signal wires to input-panel connectors). 3.0 Designing an EVA Array NOTE: When flown in the same column with full-range modules from an EVASG2 or EVA-EG2 grid, subwoofers must always be at the TOP of the array. 3.
3.0 Designing an EVA Array (cont’) 3.3 Determining EVA Array Configuration with EVADA™ (EVA Design Assistant) Software EVADA™ is Excel-spreadsheet-based software for determining optimum array configurations for a given venue and trim heights. The latest version of EVADA is downloadable from the Electro-Voice Web site (www.electrovoice.com).
3.0 Designing an EVA Array (cont’) Figure 4 shows the EVADA Main tab, where the array is built and its performance evaluated in the three frequency bands mentioned above. This tab is full of information and things to enter: 1. 2. 3. 4. 5. In the top middle of the view is where the number of suspension points (one or two, front to back), array trim height and distance downstage from front of rig are chosen.
3.0 Designing an EVA Array (cont’) Producing the most uniform front-to-back coverage is an iterative process. In general, it will be found that: 1. 2. The top-most module will be aimed above the last-row heads. This may appear to aim array output at the back wall, which if reflective could produce audible delayed signals in the front of the room. However, reference to the 3,000- and 8,000-Hz vertical polar responses shows that maximum array output is aimed at the rear-most heads, not at the rear wall.
3.0 Designing an EVA Array (cont’) Figure 5 shows the Picture tab of the EVADA spreadsheet, with a side view of the array and its suspension. The array is drawn to scale, in feet or meters as selected in the Units tab on the Venue page (English or metric, respectively). The grid tilt angle may be adjusted in this tab. One- or two-point rigging can be selected. Diagnostic messages will appear in the Messages cell, as needed.
3.0 Designing an EVA Array (cont’) Figure 6 shows the Report tab of the EVADA spreadsheet, showing such details as hang points (in this example, pinhole 0 on the centerline of the EVA-CG coupler grid), type of hang point (main or pullback), load (lb or kg), modules in the array and their vertical aiming angles (note that the module inclination angle is measured at the rear panel of the module).
3.0 Designing an EVA Array (cont’) The Cable Loss tab allows the user to enter the combined impedance of an EVA array and the length and gauge (AWG) of the wire feeding it, in order to calculate the level lost (dB) in the cable feeding the array. See Figure 7. Figure 7: EVADA Cable Loss tab, calculates the dB level lost in speaker wiring as a function of the wire gauge (AWG) and length TM The Notes tab is a place to enter comments on the particular design.
3.0 Designing an EVA Array (cont’) 3.4 Other Design Examples 3.41 Dealing with the Relatively High Low-Frequency Variation of Short Arrays The example of Figure 4 is a three-module array addressing a flat floor from a trim height of 23 feet, with the first row 10 feet away and the last row 80 ft away. The array has been aimed 10° down in accordance with the accepted practice of aiming single loudspeakers or vertical clusters of conventional loudspeakers.
3.0 Designing an EVA Array (cont’) 3.42 A Five-Module Array Example Figure 9a shows a five-module array of EVA-2082S modules in a 100-ft-deep venue with a flat floor and a small balcony/choir loft at the rear typical of many house-of-worship environments. The three frequencies not only track very well but nearly all the main floor is within ± 3 dB front to back. Balcony maintains good spectral balance at a slightly lower SPL.
3.0 Designing an EVA Array (cont’) Figure 9b: The same venue with subwoofers at the top of the main array. Bottom of the array is too low and coverage uniformity has suffered as a result, even with a second EVA-AM installed. Figure 9c: The same venue with subwoofers flown behind the main array on an EVA-CG Coupler Grid. Coverage, trim height and ground clearance are essentially identical to the same array without subwoofers.
3.0 Designing an EVA Array (cont’) 3.43 An Eight-Module Example Figure 10 shows an eight-module array in a large theater with two balconies. Note that this array cannot be driven from one amplifier channel because only one of the modules uses the optional EVA-AM attenuation module. (An eight-module EVA array can be driven from an amplifier capable of driving a 2.3-ohm nominal impedance if two of the modules have attenuation modules installed.
4.0 Preparing EVA Modules for Installation 4.1 Recommended Preflight Procedures For any installed sound system, certain checks made at the installer’s place of business can prevent expensive on-site delays. A short-list follows, and sets the stage for proper array performance: 1. 2. 3. 4. Unpack all loudspeakers in the shop. Check for proper model numbers. Check the overall condition of the loudspeakers. Check for continuity at the loudspeaker inputs.
4.0 Preparing EVA Modules for Installation (cont’) To attenuate the top HF element, remove the switch card by drawing it toward you using the central finger hole. (The switch can also be removed with the end of a flat-blade screwdriver, by placing the blade end in the switch hole and using the adjacent edge of the input panel as a fulcrum. To facilitate this operation, there is a small recess in the edge of the input panel adjacent to the hole in switch card.
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5.0 EVA Rigging System 5.1 Overview of the EVA Flying System The external rigging parts supplied with each EVA line-array module attach to internal metal parts running top-to-bottom in each module, so that a finished array places no stress on the wooden enclosure parts. The rigging simplification inherent in the EVA modules is based on the final array being assembled in a fixed manner as a single rigid structure.
5.0 EVA Rigging System (cont’) While the majority of EVA applications will be accommodated with full-range arrays of three or four modules, up to eight EVA-2082S and/or EVA-1151D modules may be suspended together up to a combined maximum loudspeaker column weight of 720 lb (327 kg). When EVA-2151D subwoofers are used, the combined maximum loudspeaker column weight is 840 lb (381 kg), or five EVA-2082S modules under two EVA-2151D modules.
5.0 EVA Rigging System (cont’) A second spreader bar, EVA-GXB, is available (sold separately). The second spreader bar is used when two front-to-back pickup points are desired/required. Figure 16 shows an EVA-SG2 grid with a second spreader bar. When two spreader bars are used, one is attached to the extreme front hole positions in the side arms and the other is attached to the extreme rear position. This gives the most control over the vertical aiming of the array.
5.0 EVA Rigging System (cont’) 5.23 Coupler Grid with or without Second Spreader Bar The EVA-CG is shown in Figure 18. This grid is used to fly up to three EVA-1151D subwoofer modules in an array behind up to five EVA2082S full-range modules and is an ideal solution when subs must be flown and trim height is limited.
5.0 EVA Rigging System (cont’) 5.25 EVA-1151D Tie Plates The tie plates included with each EVA-1151D module facilitate the assembly of multiple EVA-1151D modules in a vertical column at either zero or 5 degrees of splay between modules. They also provide the attachment points for suspending EVA-2082S modules underneath.
5.0 EVA Rigging System (cont’) 5.3 Assembling and Flying an EVA Array On each end of an EVA module are a pair of upper and lower connection points that accept the supplied M10 flathead bolts to either (1) attach the side arms of an EVA-grid to the top of the upper array module, (2) attach the tie plates supplied with each module so that the modules can be attached to each other or (3) attach an EVA-SG2 grid to the bottom module for use as a pull-up point. Figure 14 identifies these parts.
6.0 Rigging-Strength Ratings and Safety Factors 6.1 Working-Load Limit and Safety Factor Definitions The structural ratings for all of the EVA rigging components and complete loudspeaker systems are based on test results in which parts were stressed to failure. Manufacturers typically present the structuralstrength ratings of mechanical components or systems as either the working-load limit (WLL) or the ultimate-break strength.
6.0 Rigging-Strength Ratings and Safety Factors (cont’) 6.2 Structural Rating Overview Designing a safe structural array is ordinarily a very complex process best left to experienced professionals. There are two independent strength considerations that, together, give a complete description of the overall structural capabilities of any loudspeaker system; these are: 1. 2.
6.0 Rigging-Strength Ratings and Safety Factors (cont’) 6.3 Simplified Structural-Rating Guidelines The simplified structural-rating guidelines for EVA loudspeakers are charted in section 6.5. These guidelines were determined based on the: 1. 2. 3. Vertical elevation possible with EVA-SG2, EVA-EG2 and EVA-CG grids. Total weight of all enclosures in the array plus accessories, cabling and rigging. Angled forces acting on rigging components and enclosures.
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6.0 Rigging-Strength Ratings and Safety Factors (cont’) 6.4 Special Rules when Flying EVA-2151D Subwoofer Modules EVA-2151D subwoofers may ONLY be flown from an EVA-EG2 grid. Because the EVA-2151D modules have six rigging points instead of four, the maximum load ratings are higher, but also require special conditions to achieve. Please read, understand and observe the following: 1. 2. 3.
6.0 Rigging-Strength Ratings and Safety Factors (cont’) 6.5 EVA Structural Rating Charts Combinations not listed are not allowed. Position 1 (Top) 2 3 4 5 6 7 8 2082S modules on EVA-SG2 grid 720 lb (327 kg) max. column weight, any pin hole, any angle.
6.0 Rigging-Strength Ratings and Safety Factors (cont’) Position 1 (Top) 2 3 4 5 1151D modules behind 2082S modules on EVA-CG coupler grid 760 lb (345 kg) max. combined column weight, any pin hole. No bottom pull-up allowed.
6.0 Rigging-Strength Ratings and Safety Factors (cont’) 6.6 Electro-Voice Structural-Analysis Procedures Electro-Voice maintains a structural pull-test facility in Burnsville, Minnesota USA which includes load cells with digital-electronic display and recording. The load cells are calibrated annually by an independent laboratory to a standard traceable to the United States National Bureau of Standards.
7.0 Rigging Inspections and Precautions Electro-Voice EVA Loudspeaker Systems: Prior to each use, inspect the enclosures for any cracks, deformations or missing or damaged components that could reduce enclosure strength. Inspect the tie plates between enclosures for cracks, corrosion or other deformations that could reduce their strength and integrity. Check to be sure there are no missing screws and that all M10 rigging bolts are securely tightened.
8.0 References 8.1 Rigging (printed) [1] W.E. Rossnagel, L.R. Higgins & J.A. MacDonald, Handbook of Rigging for Construction and Industrial Operations, McGraw-Hill Book Company, New York, NY, USA (1988). [2] H. Donovan, Entertainment Rigging, http://www.riggingbooksandprograms.com, Rigging Seminars, Seattle, WA, USA (2002) [3] J.O. Glerum, Stage Rigging Handbook, Southern Illinois University Press, Carbondale, IL, USA (1987). [4] P. Carter, Backstage Handbook, Broadway Press, New York, NY, USA (1988).
8.0 References (cont’) 8.3 Rigging (Web sites) [1] http://www.rigging.net [2] http://www.cmworks.com/ [3] http://catalog.thecrosbygroup.com/maininterface.
Electro-Voice 12000 Portland Avenue South, Burnsville, MN 55337 Phone: 952/884-4051, Fax: 952/884-0043 www.electrovoice.com © Bosch Communications Systems Part Number F01U196199 Rev 3 02/2011 U.S.A. and Canada only. For customer orders, contact Customer Service at: 800/392-3497 Fax: 800/955-6831 Europe, Africa, and Middle East only. For customer orders, contact Customer Service at: + 49 9421-706 0 Fax: + 49 9421-706 265 Other Internatonal locations.
