MTD 112 33 06/97
and sometimes necessary to couple two enclosures to achieve some power or SPL
requirements from one source, the sound system designer should bear in mind that he will
find more easily a high-quality result by dissociating the enclosures whenever possible.
AVOID
WORKS
c) Speaker aiming.
The dual-concentric design provides a directivity that slowly increases with frequency. The
advantage of this is the optimum match in terms of coverage with the reverberating fields of
typical auditorium: The loudspeaker provides the maximum of energy exactly in the direction
towards which it is aimed. This means that the speakers should be aimed towards the seats
where the reverberating field is dominant, that is the rearmost seats.
Off axis, the listeners are nearer of the FOH loudspeaker, and hence the tilt of the tonal
balance due to the reverberating field nature is less important. This is compensated by the
attenuation of HF energy off axis, i.e. the listeners placed near of the loudspeakers should
be off the axis, and still within the nominal coverage.
The tonal balance can therefore be very similar at the near seats as well as at the remote
ones.
A proper equalization can then be performed to achieve the desirable tonal balance , which
will be valid for most of the audience.
In a multi-source configuration, simply replace the term "rearmost seat" by the term "seats
which are the furthest away from the loudspeaker allotted to cover this part of the audience
area". It really works.
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