Community ENTASYS Application Manual page 31

SYSTEM DESIGN GUIDELINES
High Ceiling, Deep Room - Long RT
Another common room type is one that is very deep, or long, in relation to its width. This is typical of some theaters or
converted cinema houses. They may or may not have flared side walls as shown in Figure 29. This room is 80L x 40W x 25H
ft (24.4 x 12.4 x 7.6 m) at the front. The side walls are angled and the floor is sloped so that the rear is wider at 70 ft (21.3 m)
and the ceiling is lower at 18.5 ft (5.6 m). The stage area is elevated 4 ft (1.2 m) and is 18 ft (5.5 m) deep with a height of 21 ft
(6.4 m). Rooms of this size often have significant reverberation times, in excess of 3 or 4 seconds, unless acoustical treatments
have been applied.
For this room two arrays, each comprising four ENTASYS Full-Range modules, are placed slightly in front of the stage area
along the side walls. The tops of the arrays are 20 ft (6.1 m) above the floor. The arrays are angled downward 4 degrees and
aimed inward 30 degrees. This cross-firing of the loudspeakers, along with the room's relatively narrow width, allows for good
stereo reproduction within this space. The SPL map indicates that the direct sound from the loudspeakers yields very uniform
coverage of approximately 104 dB over most of the audience area. It approaches 106 dB about one-third of the way back, and
is around 101 - 102 dB at the very front and very rear extremes.
The narrow vertical directivity of ENTASYS will help to significantly maximize the potential intelligibility of a sound system in
this venue. However, because of the room size, potentially high reverb time, and the wide horizontal radiation of the
loudspeakers, the use of acoustical treatment is suggested on the side walls in the front part of the room, where the SPL
reflections are the greatest. Reference Page 54, regarding early reflections and their effect on the quality of sound.
The SPL from the rear of the loudspeakers on the stage area is a bit greater than in the previous examples. This is due in part
to the 30 degree inward cross-firing of the arrays. This on-stage SPL is still much less than might be experienced with a point
source system. A further reduction in level can be achieved by decreasing the inward angle of the arrays.
Figure 29: SPL Map of Deep Room with High Ceiling
Community ENTASYS Application Guide - Page 31