Advances
in Line Array technology for live sound
by Bill
Webb and Jason Baird (November 2003)
In recent
years, the line array loudspeaker system has become the dominant player
in the touring sound industry. Line arrays are currently perceived to
offer significant benefits over horizontally arrayed clusters,
including a more consistent frequency response over the audience area,
increased high frequency throw and reduced set-up time. This paper
attempts to offer an insight into why the line array principle has been
applied to live sound and explain some of the factors to be considered
in implementing a practical design. |
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(1 MB)
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Simulation
of the acoustic field produced by cavities using the Boundary Element –
Rayleigh Integral Method (BERIM) and its application to a horn
loudspeaker.
by Stephen
Kirkup and Ambrose Thompson (July 2004)
In this
paper a method based on coupling the interior boundary element method
(BEM) and the Rayleigh Integral Method (RIM) for simulating the
acoustic field of a cavity with one opening is proposed. Such a method
has a number of applications in acoustics. In this paper we will be
applying the method to the problem of determining the acoustic response
of a typical horn loudspeaker |
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(3.9 MB) |
Line
Performance at Mid and High Frequencies.
by Henrik
Staffeldt and Ambrose Thompson (October 2004)
The
paper is
focusing on the direct sound frequency response of line arrays -
rectlinear or curved - at mid and high frequencies. In this frequency
range a line array may produce irregular on- and off-axis frequency
responses in the audience area. The irregularities, which appear as
frequency varying attenuation, depend in a complicated way on array
configuration and air absorption.
Array
performance prediction software
usually
models a line array as a number of directive point sources placed on
a line or curve. The directive point source model has been used to
simulate line arrays to study the frequency response behaviour of
line arrays at mid and high frequencies. The results of the study are
compared with frequency response predictions calculated by new
software including multi-channel array controller simulations and
measured complex spherical polar data for a specific 3-way line array
cabinet. The predictions are compared to direct sound frequency
response measurements on line arrays using the same 3-way cabinet to
show the degree of accuracy with which directive point source models
can predict the frequency responses of line arrays. |
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(0.18 MB) |
