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A.
The auto calculation routine will tend to aim the top cabinet slightly beyond
the coverage stop distance to give maximum vector summation at the furthest
listening position. This is phys ics at work and is not a shortcoming of the W8 Series
line arrays.
One benefit of this overshoot is that it can act as a hedge against coverage shortfalls
caused by temperature and wind gradients bending the projected sound downwards.
See
section 5.8
for further information about temperature and wind gradients.
Reducing echoe s and overspill
ViewPoint's auto calculation routine is based on a combination of theoretical modeling*
and practical experience and aims to give the most consistent frequency response over
the audience surfaces as well as an even SPL distribution. We strongly recommend using
ViewPoint's recommendations before attempting different schemes.
If there are highly reflective surfaces (or sensitive neighbours!) immediately beyond the
Coverage stop point you may wish to reduce the overshoot at that point. This may be
done by reducing the coverage stop distance until the top cabinet ray coincides with the
highest/furthest audience area. The trade-off will be a slight (approx 2dB) loss of level at
the highest seat in return for an echo reduction.
Reducing echoes by trimming the coverage stop
Direct echoes may be made less audible in the audience by placing the array at or, if there
are no high side seats, slightly below the height of the furthest seats.
Q.
The cabinet rays are spaced further apart in the 45 – 75m area. Surely this means
that just one cabinet is covering more than fifteen meters of the audience?
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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