Low-Frequency Strategies - Meyer Sound MILO Operating Instructions Manual

a correction to compensate for energy lost over distance;
the correction needed is usually proportional to the distance
and high frequency air absorption.
In the near- to mid-field, the air absorption is not nearly
as critical; in this zone, high frequencies need little or no
additional correction.
TIP: If your MILO line array uses a third zone
for short throws, high frequencies there may
need to be attenuated to more appropriate near-field
levels.

Low-Frequency Strategies

Although the array can (and usually should) be zoned
for implementing different equalization curves for high
frequencies, similar or identical equalization should be
maintained in all the low-frequency filters. Different low-
frequency equalization settings in the same array will
degrade the desired coupling effect.
For the same reason, gain tapering is not recommended
for line arrays, since adjusting various zones with an overall
amplitude control for each results in the following:
1. Directionality decreases.
2. Low-frequency headroom decreases.
3. The length of the line array column is effectively
shortened.
Figure 4.3: Sample block diagram of MILO array
Figures 4.2 shows a series of MAPP Online predictions
based on an example MILO system design. In this case,
small vertical splay angles on the upper part of the array
are used to cover longer distances, while greater angles are
used in the lower elements to increase vertical coverage for
shorter distances.
Figure 4.2: The MAPP Online plots on the right illustrate the vertical
directivity characteristics of the array on the left, with a section view of
the venue superimposed
The block diagram (Figure 4.3) shows one method of driving
this example array, along with additional fill loudspeakers
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