JBL EVO1.324 - Manual (Page 13)

EVOi.324
11
A P P L I C A T I O N S
LOUDSPEAKER BASICS
When to use Delay Speakers
The use of more than one EVOi.324 may be necessary in
venues with extremely long listening areas.
For example if the listening area is 120’ in depth and the
required performance is for “Loud Playback Music” the
Maximum Performance Guideline on page 10 indicates a
maximum 20’ installation height. This will provide 60’ of
throw. To cover the remaining 60’ of listening area, a
second auxiliary/delay speaker is required (see Figure 15).
A
20'
20'
40'
40' 60' 80' 100' 120' 140'
26.6°
B
20'
26.6°
Throw (Optimized Coverage Distance) A
Throw (Optimized Coverage Distance) B
Figure 15: Basic Delay Speaker Placement
Note that the sound from the delay speaker must be “in
sync” with the sound from the main speaker. This is
achieved by appropriately delaying the audio signal
arriving at the delay speaker and also by reducing its
overall output level. While these adjustments typically
require the use of complex measurement equipment,
expensive delay devices and years of audio experience,
they can be made automatically through the use of the
optional EVOi.net controller.