Multi-Purpose Conference Center - Community ENTASYS Application Manual

MU LT I‐P U R P O S E CO N F E R E N C E C E N T E R
Design Approach
This space, a multi-purpose conference center, is very wide in the rear portion of the room. The mid-band RT of this room is
very low at 0.6 - 1.1 seconds. The primary application for this system will be spoken word with the possibility of background
music. Subwoofers are not shown in this design but could be added easily with no detrimental effects. Cost is a consideration
so a minimum number of loudspeakers and channels of amplification will be used.
The desired location for the arrays is along the room's front walls. Clearly, the audience areas located at the far sides of the
rear of the room can't be covered from this position. Additional loudspeakers will be required along the side walls farther
back in the room to reach these areas.
The main audience area is drawn in EASE Focus, with the array located on the front wall (Figure 35). The front corner of this
audience area is only about 3 ft (0.9 m) from the loudspeaker; this is closer than recommended, but unavoidable in this space.
A single Full-Range module is used in the array, positioned 7.8 ft (2.4 m) high and aimed downward 2 degrees.
A second EASE Focus model is created for the delayed loudspeakers (Figure 36). Here we locate the loudspeakers on the
short section of the side wall (parallel to the front wall), facing the rear of the room. The front of the audience area for this
loudspeaker is a bit farther away at about 9 ft (2.7 m). Again, a single Full-Range module is used but positioned slightly lower at
7.5 ft (2.3 m) high and aimed downward 1 degree.
The configuration and position of the arrays are transferred from EASE Focus to the EASE model. Since EASE Focus only
models in two dimensions, the azimuth (horizontal aiming angle) of the arrays must be adjusted in the EASE 3D model to
achieve the optimal coverage. To accomplish this, the front arrays are aimed inward 15 degrees, while the delayed arrays are
aimed inward 32 degrees.
Results
The audience areas in Figure 37 exhibit uniform direct SPL ranging from 102 - 105 dB over the majority of the coverage area.
The very front corners reach 106 dB due to their proximity to the loudspeakers, but this only affects 2 - 4 seat locations. The
very rear-most corners of the side areas are also about 1 dB lower at 101 dB, but again, this only affects 2 - 4 seats. The
potential intelligibility of this system is good, with C50 ranging from 1.5 - 5.0 dB. The STI is approximately 0.66 and the
%Alcons is about 5.0%
What To Look Out For
The side walls should not present too much of a problem in a room like this, and their reflections can often increase both the
overall SPL and the potential intelligibility if their time-of-arrival is within the proper interval relative to the direct sound.
Reference Page 54-55, regarding supportive reflections. Should these reflections present problems, diffusion can be employed
to decrease their detrimental effects while maintaining a high SPL. If rear wall reflections appear to be problematic, diffusion or
absorption may be added.
Loudspeakers, Brackets, and Power Amplifiers Used in This Design
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(4) ENTASYS Full-Range Modules (ENT-FR) Each configured fully curved (as shipped from Community).
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(4) ENTASYS Pan-Tilt Brackets (ENT-PT)
•
(1) Two channel amplifier rated at 3,600 W per channel into 4 ohm
•
(1) Delay unit and high pass filter or DSP unit
•
(1) High pass filter, 2 output delays, or DSP unit
DESIGN APPLICATION EXAMPLES
Community ENTASYS Application Guide - Page 40