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2-17
The design of a distributed wall mount system is similar to an overhead system, with some
important differences. In a wall mount system the speaker-to-listener distance depends on the
listener location in the room. Therefore the audibility calculations must be done with the listener
at the farthest distance from the speaker. In a room with speakers mounted along a single wall, the
farthest distance (lowest SPL) can be taken within 3 feet (1 meter) of the opposing wall.
In general, the wall mount speakers are located between 80 and 96 inches above the floor. This
satisfies the requirements for speaker-strobe combination units. The figure below shows the
typical coverage of a wall mount speaker.
Wall
Wall
Simplex Wall Mount Speaker
Coverage Example
5
2
º
o
f
f
a
x
i
s
On Axis
-6dB
Viewed from ceiling
Room Depth
Coverage Width
Critical Polar Angle
3' off wall
Figure 2-8. Wall Mount Speaker Coverage Pattern
The coverage patterns for wall mount speakers are the same for distributed overhead systems, with
the goal of minimizing SPL variations in the protected area. Equation 2-11 can be applied to wall
mounted systems by replacing the speaker to listener distance (D2) with the room width minus
3 feet. In a wall-mounted system, it is generally more appropriate to consider the diameter of
coverage rather than the coverage area. The coverage diameter defines the width of wall
coverage, and ultimately the speaker spacing depending on the coverage overlap pattern.
Table 2-4. Wall Mounted Speaker Coverage Width Vs. Room Depth
Wall Mounted Speakers (In Feet)
Wall Mounted Speakers (In Meters)
Room
Width
Coverage Width
3 Feet from Wall
Opposite Speaker
Room
Width
Coverage Width
1 Meter from Wall
Opposite Speaker
10 Feet 18 Feet
2.5 Meters 3.8 Meters
12 Feet
23 Feet
3.0 Meters 5.1 Meters
14 Feet
28 Feet
3.5 Meters 6.4 Meters
16 Feet
33 Feet
4.0 Meters 7.7 Meters
18 Feet
38 Feet
4.5 Meters 9.0 Meters
20 Feet
44 Feet
5.0 Meters 10.2 Meters
5.5 Meters 11.5 Meters
6.0 Meters 12.8 Meters
Continued on next page
Distributed Wall Mounted Systems, Continued
Design of a
Distributed Wall
Mount System