User Manual

4
Standard speaker (point source)
3
Less prone to feedback
As we have seen, the total output from line-array speakers is smaller and undesirable reections are fewer, making
feedback less likely to occur. Another important factor, however, makes the line array less prone to this type of problem,
and this is described below.
Whenever a certain sound pressure must be achieved at a specic distance, the line-array speaker, which adds the sound
energy output by multiple speaker units, will require less output energy per unit than a standard point-source speaker
system. A microphone in close proximity to the array will—as shown in the bottom diagram below—only pick up the
relatively small amount of energy from the closest units. The total incoming energy will thus be considerably smaller than
with the standard speakers, meaning that feedback is less likely to occur.
The microphone picks up a larger amount of incident energy.
The reinforced sound comes from a single source, so the energy is not scattered.
Line-array speaker (line source)
The microphone picks up a smaller amount of incident energy.
The reinforced sound comes from multiple speaker units, and the total energy is distributed among them.
The energy from only some of these speakers is picked up by the microphone.