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4.4. THE CURVATURE OF THE ARRAY
4.4 The curvature of the array
Directivity on the vertical axis of an array of sources depends on the shape of the array. We know that
perfectly straight arrays create a very narrow central lobe, which is a problem in most typical sound
reinforcement applications. The solution which proved to be the most effective for typical sound rein-
forcement applications is the employment of arrays with a progressive curvature
optimized for progressive array use (figure 4.4 shows the different kinds of arrays)
When designing sound reinforcement with an AXIOM system we advise imposing a progressive
curvature to the array, which is using a sequence of progressively increasing angles. This way the
sound range will gain maximum stability, resulting in a greater uniformity of coverage and in easier
system equalization.
4.5 System Processing
The AXIOM Series Systems do not feature passive filters and, to work, they need an external processor
to take care of crossover filtering, temporal alignment and protection of all devices. Proel provides
DSO26 digital processor which comes with all the presets for the AXIOM line. All updates for Proel
Presets can be downloaded from our website: sound.proelgroup.com
Systems have been designed for top performance. The optimization of vertical array systems through
digital processing is based on data obtained through measurements of the polar response throughout
space and on their elaboration through purpose-designed mathematical models. Presets provided with
the AXIOM series allow the correct operation of the system, provide the best starting point for setup of
temporal alignment, gain adjustment and, eventually, system equalization.
The creation of customized presets to correct the system response is impossible
without having access to the equipment and to the knowledge that provide specific
For this reason, in order to obtain the best sound quality possible and to avoid involuntary mistakes,
processor Proel DSO26 grants access only to parameters related to gain trim and to the delay of some
pass band outputs, which, together with equalization, are the only ones needed for setting up the system.
The use of presets provided by Proel guarantees the correct and safe operation of the system.
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A very thorough article on this subject is: Ureda, Analysis of Loudspeaker Line Arrays, JAES, Vol. 52, No. 5, May 2004. It
analyses linear arrays, j-shaped arrays and progressive (or spiral) arrays.
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Presets for DSO26 are compatible with processor XTA226. Presets with linear phase filters to be used with Lake Contour Pro
26 are also available.
Figure 4.4: Different Vertical Array typologies
measurements and allow the elaboration of such data.
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. Presets created for the AXIOM
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4. Sound design with AXIOM
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. AXIOM Systems are
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