Martin Audio W8L Longbow Application Manual page 15

5.3 Line array behaviour
Although the vertical coverage of a single point source may be wide, when arrayed in a
straight line, multiple, acoustically small sources vector sum to form a tighter vertical
coverage pattern that narrows with increasing cluster height and frequency following
the classic law for multiple source line arrays.
* = speed of sound (m/s).Varies with temp.
Arcsin = "the angle whose sin is..."
Nd = the total height of the column in meters
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