Martin Audio Wavefront W8CT, Application Manual

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power amplifier level control advanced in sequence to check system operation and
patching.
Assuming that controller output levels and limiters have been set as tabulated in
Section 2.5 , power amplifier level controls should be set to full (fully clockwise) for
loudspeaker sections requiring the strongest drive. Amplifiers, driving nearer-field
sections within the same cluster, may be backed off as required for smooth coverage.
This process will ensure that the cluster coverage remains balanced during limiting.
Rack mounting
Always leave a 1U space between power amplifiers and controllers. Although most
modern amplifiers don’t radiate significant fields it’s better to play safe and keep the
system quiet. The spare space may prove useful when last minute controller additions
are required for, say, extra audience fills. Rear supports are recommended. Check the
manufacturer's application notes for details.
2.7 General system reminders
1) Where possible, use the same model system controller and power amplifier for
a particular Wavefront product. This avoids confusion caused by different
controller topologies or by power amplifiers with different voltage gains for
the same output specs.
2) It is common practise to use mixing console matrix outputs as loudspeaker
section controls. Whilst this is fine for creating a bass submix which can
easily be judged from the mix position, it can be fraught with danger if used
for Longthrow loudspeaker sections which may only be audible by touring the
site on a bicycle! Trim outfield sections during listening tests with a colleague
via walkie talkie, using the relevant controller input gains.
If the console matrix is the only solution available, try to pre-calibrate the
matrix output levels controls to their 0dB (nominal) position initially. These
settings will be easier to get back to and will avoid embarrassing level setting
mistakes during the show - particularly if the system is being used by guest
operators who may not be familiar with your particular matrix allocations.
3) And again, trim levels within clusters (eg inners vs outers) using the amplifier
level controls to ensure limiter tracking.
All material © 2007. Martin Audio Ltd. Subject to change without notice.