Community ENTASYS Application Manual page 26

SYSTEM DESIGN GUIDELINES
EASE Focus can be an excellent tool and a great time saver in determining the preliminary aiming of a line array. It is important
to note, however, that EASE Focus provides only a 2D representation of the loudspeaker coverage (Figure 24). Once the
number and types of loudspeakers are determined, along with the positioning and aiming required to achieve the desired
coverage and response across the audience area(s), the array configuration and position can then be copied to a 3D model in
EASE, where the horizontal coverage of the loudspeaker array can be verified and adjusted. This cannot be done automatically;
the number of units in an array and their positioning must be manually input into the EASE program. Even so, using EASE
Focus provides for faster and easier array configuration and positioning than can be accomplished using EASE alone.
Figure 24: SPL Map from EASE Focus of Three ENTASYS Full-Range Modules (400 Hz - 4 kHz)
U S E O F T H E LOW F R EQ U E N C Y M O D U L E
The ENTASYS line of loudspeakers features two models; the Full-Range loudspeaker ENT-FR and the Low Frequency
module ENT-LF.
1. Both models are identical in appearance until the grille is removed. The Low Frequency module is designed for two
purposes: They may be added to an array to increase its low frequency SPL output capability. This will not extend the low
frequency cut-off of an array below 200 Hz. However, it will increase the output capability of an array in the 200-1,000 Hz
region.
2. The Low Frequency module will also provide greater directivity control for an array below 1,000 Hz.
The Low Frequency module is equipped with its own internal passive crossover to facilitate integration with the Full-Range
module. The recommended high pass filter should still be used in the signal path before the power amplifiers driving the
ENTASYS systems.
As noted in the Differences Between Line Arrays and Point Source Loudspeakers section (Page 18), the LF directivity control of a
line array is based on its length. More specifically, the length of a line array should be equal to or greater than one-half the
wavelength of frequencies over which directivity control is desired. Moreover, for a line array to have the very small opening
angle typically associated with line arrays, the length of the array should be much larger than this – typically two to four
wavelengths long. In air, 1,000 Hz has a wavelength of approximately 1.13 ft (0.34 m). This means an array length of
approximately 4.52 ft (1.38 m) is needed for the array to have a small opening angle at 1,000 Hz. For lower frequencies the
array length must be even longer to maintain the same small opening angle.
Community ENTASYS Application Guide - Page 26