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The 4-cabinet system low mid projection is less efficient than its upper mid projection
because too few cabinets have been used for the line to be effective at low frequencies.
The smaller system would project clean vocals but it would sound thin – lacking warmth
and authority.
The 12-cabinet system 200Hz, 600Hz and 6KHz responses are closer together (and,
obviously, at a higher amplitude). The longer line has "kicked" the low-mid frequencies
out further so that they can keep up with the mid and high frequencies.
A 12-cabinet array provides excellent spectral tracking over typical stadium distances
whilst providing the extra high frequency headroom required to partially counter air
absorption.
Note that, as air absorption increases, upper mid frequency characteristics tend to track
lower mid characteristics with high frequencies tailing off.
Model and quantity for a balanced spectral response
A spectrally balanced system will provide a useful far- field response within an octave of
the product's LF and HF specification.
A system's LF response may be enhanced by extending the effective column length with
subwoofers flown above or stacked immediately below the array.
HF air absorption is the dominant factor beyond 50m. Be cautious about specifying very
long throw systems where the air may be dry (e.g. for outdoor events during hot, dry
weather, for desert regions or for venues with warm air heating). See sections
The chart on the following page indicates the minimum quantity and model for the
required throw. The chart is based on applications experience and line array physics as it
is currently understood.
Note: The cabinet quantities refer to low curvature arrays or the low curvature (upper)
sections of progressively curved arrays.
All material © 2007. Martin Audio Ltd. Subject to change without notice.
5.8
& 5.9.
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