1258 Chapter 34
two-way or three-way enclosures suspended in a verti-
cal line. The other type of line array is a column line
array. This type of line array uses multiple cone-type
loudspeakers in a single column-style enclosure, Figs.
34-14 and 34-15.
By virtue of their height, both types of line arrays are
capable of providing narrow vertical dispersion
patterns. This can help the designer keep the sound
aimed at the audience and away from a hard reflecting
ceiling. Depending on placement it may also help
reduce feedback problems by keeping the sound away
from system microphones.
Concert line arrays are usually designed with a
specific horizontal dispersion pattern provided by
horn-type mid- and high-frequency components.
Commonly this is a wide angle to cover listeners near
the front of the room. In a rectangular room, this wide
horizontal dispersion means there will be significant
reflections from the walls along the sides of the room.
In many rooms, these are beneficial reflections that
increase Lp and intelligibility. However, the system
designer must be aware of these reflections and confirm
that they are useful.Figure 34-13. EV Vari-Intense. Courtesy Bosch/
Electro-Voice.
Figure 34-14. Column-style line array. Courtesy Renkus
Heinz.
Figure 34-15. Modular line array. Courtesy QSC.