Rigging And Suspension; Amplification - Martin Audio WT UB Manual

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CONTENTS PRINT GUIDES
4.2

Rigging and Suspension

WARNING Suspending the system should only be done by qualified
personnel following safe rigging practices. Secure fixings to the building
structure are vital. Seek help from architects, structural engineers or
other specialists if in any doubt.
The WT UB is supplied with threaded inserts and a mounting yoke to allow the
suspension of a single enclosure. Please note that suspending one
enclosure from another using these inserts to form an array or cluster is
not recommended.
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AMPLIFICATION

The WT UB speaker should be used with professional power amplifiers
capable of producing 200-400W into 4 ohms.
Whilst the WT UB does not require a controller for crossover or equalisation
functions it is advisable to provide signal limiting to avoid amplifier clipping. To
perform this function the WX3A, MX5 and DX1 controllers can be configured
purely as high performance limiters.
Additional protection of the high frequency line array is provided by an auto-
resetting over-current device. This protects against overload as a result of
severe amplifier clipping and short high frequency, high power bursts such as
microphone feedback. When the over-current device operates it may be
necessary to turn down the signal level to the speaker in order to reset the
device and restore high frequency output.
It is important to understand that a low power amplifier driven into clipping is
more likely to damage a loudspeaker than a higher power amplifier used
within its ratings. This is because music signals have a high peak-to-average
"crest" factor. When an amplifier is severely overdriven, its output waveform is
clipped (its peaks are squared off) – reducing the crest factor. In extreme
cases, the waveform can approach that of a square wave. An amplifier is
normally capable of producing far more power under these conditions than its
undistorted rated power output.
The use of very high power amplifiers with outputs greater than those
recommended is discouraged.
Care should be taken to avoid switch-on surges, which can result in
momentary power peaks in excess of specified ratings. When powering up a
sound system it is important to switch on the amplifiers after the mixer and
control electronics have stabilised. When powering down the system, reverse
the sequence and switch off the amplifiers first.
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All material © 2007. Martin Audio Ltd. Subject to change without notice.
Martin Audio – WT UB