Martin Audio Wavefront W8CT, Application Manual

Page: 172 / 247

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?
A. The rays shown on ViewPoint
tm
can be a little misleading because a series of
rays arriving at a shallow angle will appear to be widely spaced.
Many users equate this with the sun’s rays which weaken as the sun sets. In fact, the
setting sun’s power weakens due to greater absorption of shorter wavelengths through
the earth’s curved atmosphere not because the rays are arriving at a shallow angle.
With W8L Series arrays, the sound pressure level at any point in the room can be
thought of as the vector sum of all the ca/-7.5 degrees from that point, not
simply due to the cabinet whose ray is aiming there. The example above shows that
the “cabinet 7” area receives contributions from cabinets 3 to 11, not just cabinet 7.
ViewPoint
tm
’s Progressive Curvature calculations ensure that inter-cabinet splay
angles increase gradually from the array and arrays are driven slightly harder towards
the top of the array to partially compensate for air losses. This combination of
Progressive Curvature and Band Zoning gives maximum projection to the furthest
seats and the smoothest coverage.
5.5.13 Using ViewPoint
tm
for systems with sub-woofers
Flown W8LS sub-woofers
By default all W8LS splay angles are set to zero. If possible raise the array height so
All material © 2007. Martin Audio Ltd. Subject to change without notice.