an idea on how the same auditorium floor plan could be easily covered in a surround-style arrangement with just two EVI systems per side rather than four distributed arrays. Although not providing the high- est intelligibility or smoothest response, it is appli- cable to cinemas and some musical preferences. This has the advantages of cutting installation time, amplifier channels, additional delay lines and at the same time providing superior coverage.
A gymnasium is another perfect application for the EVI systems, covering each grandstand from a pair of centrally located EVI systems (see Figure 8). In addition, you can cover the entire gymna- sium from either a single lengthwise-oriented sys- tem or with a pair of widthwise-spaced systems with lower-SPL coverage on the floor of the gymnasium than in the stands, so the players are not disturbed by announcements (see Figure 9).
When the EVI-12 and EVI-15 systems are tilted up approximately 15°, their coverage pattern lengthens to match a level EVI-28 at 5 times the height. In such cases the systems work very well to
replace a distributed system along a very long, fairly wide corridor where very high SPLs are not required on a continuous basis (such as an airport concourse with 15 to 20 foot ceilings, where a speaker would be placed about every 75 feet). See Figure 10 for approximate mounting locations and floorplan coverage.
These are but a few of the widely varied applications where the new EVI-12, EVI-15 and EVI-28 systems will easily outperform a conven- tional system. The extremely uniform coverage of the systems are fairly insensitive to placement, re- quire only a few simple calculations to find the best mounting location, and the aiming angle is no more or less sensitive than a conventional loudspeaker. This makes installation nearly foolproof. Even installation in non-optimal conditions will produce remarkably even coverage and high intelligibility.
As questions arise, you may feel free to con- tact us at 800/234-6831, or FAX at 616/695-1304.
NOTE: All figures are direct-field SPL and C50 produced in EASE with interference turned on when applicable. All plots depict the intended listening areas only, and do not include the “offset distance” to the first row. For example, the first set of plots on figure 3 depict the same 54’ x 36’ area as figure 1. See notes on simulation software.
Figure 1
18’ HEIGHT 
AND 
0° 
AIMING
ANGLE
FLOOR)