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Electro-Voice® EVA Series User Manual8
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).
Briefly, one models the room along the horizontal aiming axis of the array, then builds the array of long-
and/or short-throw modules that produces the most even coverage front to back. (As described above,
EVA modules come in two horizontal coverage angles, 90° and 120°. Following industry convention, these
angles are defined where output is 6 dB down from the maximum [usually on axis] output. Chose the hori-
zontal angle that provides good coverage of the audience in plan view but minimizes energy directed on
reflective wall surfaces, which energizes the room and lowers the intelligibility 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 closer to the mid- and high-
frequency performance of the array. These effects can be easily seen in EVADA. In addition, the frequen-
cies and bandwidths can be modified by the designer.
EVADA includes an extensive help file but the following overview will provide a good introduction.
Figure 3 shows the Venue tab of the EVADA spreadsheet, where the room information is entered, includ-
ing dimensions, head height, stage specs (optional) and the so-called “acoustic reference point.” This is
the point in the venue where EVADA makes its sound-pressure level (SPL) calculations. The acoustic-ref-
erence point is typically the mixing position. If uncertain, enter a position in the middle of the main cover-
age area.
Figure 3:
EVADA
TM
Venue tab, where room information is entered