Master Audio
Xcellence Line Array Series 208.Ver 1.2
Sep 12
3
1. INTRODUCTION
1.1. General product information
Master Audio
thank you for the trust placed in our
Xcellence
loudspeaker systems.
The Line Array Xcellence models combine the benefits of their high quality sound
transducers, the convenience of a self-powered system and the flexibility of the DSP
(digital system processing) for cabinet control.
More than 38 years’ experience in amplifier and acoustic cabinet design using the
highest technology and components come together to give you a product ideal for a
multitude of applications, specially those which require high levels of sound pressure
and a control of vertical coverage. Stadiums, theatres or big events will become the
perfect places for its use.
We suggest you read the following information with attention, assured that it will be of
maximum use in helping you to achieve the best results and optimum performance.
1.2. What is a line array?
The trend in sound reinforcement has been to increase both the sound pressure level
(SPL) and the size of the audience to be covered. This leads to an increase in the
number of cabinets and, as a result of this, an increase in the total size and weight.
A line array is a group of independent sound sources which are vertically stacked in
order to transform the spherical wavefronts generated by individual sources into a
single flat wavefront.
Fig.1.
Wavefield interference for different wavefronts.
To carry out effectively arraying individual sound sources the system must follow the
acoustic coupling conditions based on the wavelength, the shape of each source, the
surface area of each transducer and the relative source separation.
An assembly of individual sound sources arrayed with regular separation between the
sources on a plane or curved continuous surface is equivalent to a single sound
source having the same dimensions as the total assembly if the following conditions
are fulfilled:
1) The step of source separation, defined as the distance between the acoustic
centres of the individual sources, is smaller than half the wavelength over the
bandwidth of operation.
