Specifications

Community R2-Series Installation/Operation Manual — Page 10
R2 COVERAGE PATTERNS
The coverage pattern for the particular R2 model being used must be understood for proper aiming of the
loudspeaker.
ASYMMETRICAL COVERAGE PATTERN (R2-474 and R2-694 only)
The mid and high frequency horns for the R2-474 and R2-694 are unique asymmetrical designs. Their horizontal
dispersion patterns are narrower in the upper part of their vertical coverage pattern and wider in the lower part.
Also the vertical coverage angle is greater below the loudspeaker’s geometric axis than above it (See Technical
Specifications and FIGURE 5). This design has two primary benefits:
1. In the upper portion of their vertical coverage patterns, the mid and high frequencies are concentrated in a
narrower beam thus effectively increasing their output there. With proper orientation, this portion of the
loudspeaker’s coverage pattern is used for listeners at longer distances from the loudspeaker. Because you
lose 6 dB SPL for each doubling of distance, more output is needed for projecting sound over the longer
distances. By contrast the lower portion of their vertical coverage patterns are spread over a wider horizontal
area resulting in lower output towards the listening area nearer to the loudspeaker. This design provides
more uniform sound level from the near to far listeners.
2. Because of the geometry of these asymmetrical coverage patterns, the relative width of the coverage area
stays more uniform from short to long distances. This is graphically illustrated in FIGURE 2.
AIMING AXIS (R2-474 and R2-694 only)
The nominal vertical coverage patterns for the mid and high frequency section for the R2-474 and R2-694 are 15
degrees above the geometric axis of the loudspeaker and 25 degrees below it. As illustrated in the “Side View”
in FIGURE 2, this means the acoustical axis of the mid and high frequencies is not the same as the geometric
axis, which is perpendicular to the face of the loudspeaker. This acoustical axis is approximately 5 degrees
downward when the loudspeaker is physically aimed straight ahead. This acoustical axis is used to aim the
loudspeaker.
In contrast the coverage pattern of the low frequency section, for both loudspeakers, is symmetrical so its
acoustical axis is the same as the geometric axis of the loudspeaker. The result is that there is relatively more
low frequency energy projected above the mid and high frequency acoustical axis than below it. This better
matches the low frequency output to the mid and high frequency output throughout the loudspeaker’s coverage
pattern.
These points should be taken into account when aiming the loudspeaker. For proper aiming, the R2-694 and R2-
474 loudspeakers will be tilted down about 5 degrees less than a loudspeaker with a symmetrical coverage
pattern.
COVERAGE PATTERNS