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Electro-Voice® EVA Series User Manual

Figure 5:

EVADA

TM

Picture tab

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 suspen-
sion. 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.

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Содержание EVA-2082S/1220

Страница 1: ...Electro Voice EVA Series User Manual EVA Series User Manual EVA 2082S 906 EVA 2082S 920 EVA 2082S 126 EVA 2082S 1220 ...

Страница 2: ...eflight Procedures 17 4 2 Module Configuration 17 5 0 EVA Rigging System 20 5 1 Overview of the EVA Flying System 20 5 2 Deciding which Grid Configuration to Use with an EVA Array 21 5 21 Standard Grid with or without Second Spreader Bar 21 5 22 Extended Grid with or without Second Spreader Bar 22 5 23 Use of Two Standard Grids 23 5 3 Assembling and Flying an EVA Array 24 6 0 Rigging Strength Rati...

Страница 3: ...and practices as commonly recognized in the United States and is believed to be accurate at the time of original printing As such the information may not be directly applicable in other countries Furthermore the regulations and requirements governing rigging hardware and practices may be superseded by local regulations It is the responsibility of the user to ensure that any Electro Voice loudspeak...

Страница 4: ... of Figure 1 Each EVA module contains two separate vertically stacked line array elements EVA 2082S 906 two way LF HF line array module with a 90 horizontal x 6 vertical coverage pattern for long throws and passive crossover HF shading EQ network The enclosure is trapezoidal in the verti cal plane with a 6 total included angle The two line array elements contained in the module are vertically spla...

Страница 5: ...o fasten one module to another and two cosmetic end caps which give the finished array a smooth and unclut tered appearance The end caps on FG fiberglass versions are also finished in fiberglass Black is indi cated by BLK or B at the very end of the complete model number and white is indicated by WHT or W at the very end of the complete model number e g EVA 2082S 906 BLK and EVA 2082S 906 PIB EVA ...

Страница 6: ...2S 906 or EVA 2082S 126 dimensioned views Figure 1b EVA 2082S 920 or EVA 2082S 1220 dimensioned views Bottom View Front View Top View Left View Right View Rear View Spreader Bar Attach Holes Bottom View Front View Top View Left View Right View Rear View Spreader Bar Attach Holes ...

Страница 7: ...ning through the intersection of the top two modules intersect the head of the person in the last row This situation is shown in Figure 2 3 2 Typical Number of Arrays Line array systems usually consist of vertical columns of multiple independent line array elements The most common implementation is probably a stereo sound reinforcement system with two columns left and right Additional columns are ...

Страница 8: ...ity of the sound system EVADA displays coverage in three frequency bands The default bandwidth is one third octave The de fault frequencies are 500 Hz 3 000 Hz and 8 000 Hz 3 000 Hz is very important for voice intelligibility 8 000 Hz is important for sparkle 500 Hz and below is important for maintaining a good spectral bal ance throughout the venue Longer arrays provide low frequency uniformity c...

Страница 9: ...formance This button appears in the Main Cluster geometry view one is shown in Figure 9 The module vertical aiming angles are also displayed with a different colored slightly splayed line pair for each module as noted in Section 1 0 there are two line array elements in each EVA module vertically splayed by 3 or 10 depending on model If the Show Polars box is checked under Options the vertical pola...

Страница 10: ...e 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 2 The lower modules will be attenuated This is required because the lower modules are so much closer to the seats they cover than are the upper modules Coverage uniformity of 3 dB front to back is a good goal for mid and high frequencies At 500 Hz and below such unifor...

Страница 11: ...A spreadsheet with a side view of the array and its suspen sion 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 11 ...

Страница 12: ...vitable multiple source interference that occurs when two or more arrays are displaced horizontally This is done by show ing the horizontal polar response of subwoofer arrays at three frequencies The default frequencies are 90 60 and 40 Hz but can be changed The option of changing the polarity of each subwoofer and inserting up to 9 9 ms of delay in any one group of subwoofers is available These o...

Страница 13: ...M Cable Loss tab calculates the dB level lost in speaker wiring as a function of the wire gauge AWG and length The Notes tab is a place to enter comments on the particular design The Supported Products tab shows both the EVA main array products but also Electro Voice subwoof ers which are suitable for use with EVA arrays These vary in maximum acoustic output ability and low frequency cut off frequ...

Страница 14: ...nt to a high of 8 dB about 25 of the way back then falling slowly back to 0 dB at the rear This is a function of the relatively short 4 7 ft three module array The variation at 100 Hz not shown is even greater 6 dB and drops continuously from front to back This means that if the sound is well balanced up front it will be thin at the rear although intelligibility and clarity will be fine Figure 8 s...

Страница 15: ...out halfway back The three frequencies not only track very well but nearly all of the venue is within 3 dB front to back This desirable situation is helped by not only the 3 dB attenuation of the top module but also by the array being longer than the three module examples above 4 4 ft versus 7 3 ft Figure 9 A five module EVA example whose three predicted frequencies not only track well front to ba...

Страница 16: ...pedance if two of the modules have attenuation modules installed A solution is to use two amplifier channels one for the top four modules and one for the bottom four In order to preserve the pre dicted array coverage be certain that the voltage gains of both channels are the same Nearly all of the 100 ft deep main floor is covered within the optimum 3 dB at all three predicted fre quencies The sam...

Страница 17: ...ate array the high frequency HF shading or use of the optional attenuation modules should be noted In this way these settings and options can be configured on the systems as they are rigged together and suspended The shading adjustments and installation of attenuation modules can be completed at the installer s shop but then care must be taken to see that the EVA modules are properly identified to...

Страница 18: ...lding screws with a Phillips 2 screwdriver The cable assembly that connects the input panel s green PC board to the crossover equalizer network inside the EVA module is long enough to allow the input panel assembly to rest on a flat surface close to the EVA module If necessary the crossover equalizer cable can be temporarily disconnected The removed input panel assembly is shown in Figure 12 2 Unp...

Страница 19: ...input panel removed showing green PC board and the four bosses to which the optional EVA AM attenuation module will be attached Figure 13 EVA input panel with EVA AM installed showing connector plug in 4 0 Preparing EVA Modules for Installation cont 19 ...

Страница 20: ...ether The specific selection of long and short throw modules and their arrangement is dependant on room ge ometry and trim height These choices are facilitated by Electro Voice s EVA Design Assistant EVADA software available on the EV Web site www electrovoice com See section 3 0 Designing an EVA Array above Each EVA module is attached to the module below it by the supplied pair of side mounted ti...

Страница 21: ...s or other device s used to lift the array into position can be attached Using the two end points provides horizontal stability for the array Using the center point will probably require a tie off to stabilize the horizontal position of the array Figure 15 EVA SG grid down angle of the array is determined by the front to back position of the spreader bar When the standard grid with its single spre...

Страница 22: ...d For this reason the EVA EG extend ed grid is probably a better choice when using front to back pickup points 22 Figure 16 EVA SG standard grid with optional EVA GXB spreader bar 5 22 Extended Grid with or without Second Spreader Bar The EVA EG extended grid is also available Arrays taller than four modules will probably require the extended grid whose side arms are 12 inches longer to the rear T...

Страница 23: ...gure 18 shows this configuration When using two grids in this fashion the angle between the suspension lines must never be allowed to exceed 60 Do not use EVA EG extended grids in this application For overall down angles of approx 45 or greater use the second to last hole of each grid For overall down angles of less than ap prox 45 use the second to last hole on the bottom grid and any hole forwar...

Страница 24: ...ded attach a tie plate flat end to the rear to each end of the suspended module but do not fully tighten screws 3 Move the second module into place under the suspended module between the tie plates 4 Align the holes in the tie plates with the corresponding holes in the lower module and as semble to the one above with four M10 flathead screws provided 5 Fully tighten all eight M10 screws 6 Connect ...

Страница 25: ...d not structurally fail until a force of at least 8 000 lb 3 629 kg was applied based on an 8 1 safety factor However the user should never apply a load to that part that exceeds 1 000 lb 454 kg The safety factor provides a margin of safety above the working load limit to accommodate normal dynam ic loading and normal wear CAUTIONS for Working Load Limits and Safety Factors The working load limits...

Страница 26: ...e rigging points acting on the rigging components and the array as a whole For 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 bolts grid side arms and spreader bars 2 The total strength of the overal...

Страница 27: ...e resulting analysis has shown that any combination of EVA 6 vertical modules EVA 2082S 906 and EVA 2082S 126 and EVA 20 vertical modules EVA 2082S 920 and EVA 2082S 1220 may be rigged together at any vertical angle available from either a single EVA SG or EVA EG grid at the top of the array using one or two spreader bars or an EVA SG grid and spreader bar at both the top and bottom of the array a...

Страница 28: ... Do not use EVA EG grids in this application 3 The suspended column must be perpendicular plumb to within 5 degrees as shown in Figure 20 4 If a spreader bar is suspended from two points the angle between those two suspension lines must not exceed 60 degrees Maximum 30 degrees from plumb each as shown in Figures 21 and 22 5 Never attempt to suspend EVA systems overhead by any other method than the...

Страница 29: ...ual 6 0 Rigging Strength Ratings and Safety Factors cont 29 Figure 21 Side to side angular pull structural rating guidelines for EVA spreader bars Figure 22 Front to back angular pull structural rating guidelines for EVA spreader bars ...

Страница 30: ...te of the art computer modeling programs for structural analysis throughout the development of loudspeaker systems The computer modeling enables the complex forces in the rigging components and enclosures to be analyzed for loudspeakers assembled into arrays in both static and dynamic conditions Structural testing and computer modeling were used throughout the engineering development of all EVA in...

Страница 31: ... 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 or the structure from which it is suspended Building Tower or Scaffold Supports Prior to each use the strength and load bearing capabili...

Страница 32: ...roderick Bascom Rope Company Rigger s Handbook Sedalia MO USA 1993 8 MacWhite Wire Rope Company Catalog of Tables Data and Helpful Information Kenosha WI USA 1991 9 Acco Chain Lifting Division Chain Sling User s Manual Acco Corporation York PA USA 1992 10 Newberry W G Handbook for Riggers Newberry Investments Company Calgary Alberta Canada 1989 8 2 Mechanical Engineering printed 1 R C Hibbeler Eng...

Страница 33: ...Electro Voice EVA Series User Manual 33 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 htm ...

Страница 34: ...Electro Voice EVA Series User Manual 34 Notes ...

Страница 35: ...Electro Voice EVA Series User Manual 35 Notes ...

Страница 36: ...0 392 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 For customer orders Contact Customer Service at 1 952 884 4051 Fax 1 952 887 9212 For warranty repair or service information contact the Service Repair department at 800 685 2606 For technical assistance contact Technical Supp...

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