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9
Line Array
Application Guide
How Array Length Affects Directivity
It would be beyond the scope of this guide to
go into the physics of how line arrays behave.
The key to directivity is array length. This
should not be confused with the number of
drivers. A properly designed line array system
will exhibit the same directivity from the
same physical length regardless of whether
this length is made up of 8”, 10”, 12” or 15”
components.
The determining factor is the length of the
array itself and how that length affects the
wavelength being produced.
The samples below show three array types
in the same venue. The first array is very
short with only 4x KF810P-80 modules
being deployed. The contour line feature in
Resolution has been used to clearly show the
definition of the vertical contour at 125Hz. It
is clear that with this array length, the 125Hz
frequency is seeing only slight directivity
control.
The second image demonstrates what would happen with the same frequency in the same
venue but with 8x KF810P-80 line items. It is quite clear how much more directive the vertical has
become in this image and if we continue to add modules to the array, the effect will become more
pronounced.
