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.
Blackline Series enclosures are designed for portable applications, but can
be suspended singly by means of the threaded inserts provided. The F215
enclosure is fitted internally with steel corner reinforcement brackets to
ensure that each cabinet is strong enough to be hung from its top.
Never
suspend one enclosure from another to form an array or cluster using
these fittings.
The common practice of using commercially available eye bolts for
suspension should only be undertaken with great caution. Eye bolts are
strongest along the thread axis. Angling the enclosure will result in an angle
pull and it is important to use eye bolts that are safe in these
circumstances. Only forged shoulder eye bolts should be considered and it
is important that the thread length is at least 30mm. A flat washer should be
inserted between the eyebolt and the enclosure.
Formed eye bolts i.e.
those which are formed from a steel rod bent into an eye should be
avoided.
5
AMPLIFICATION
The F215 loudspeaker is designed to be used with professional power
amplifiers capable of producing the 400-1000W into 4 ohms:
Care should be taken to avoid amplifier clipping. 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.
Martin Audio – Blackline F215
E
NGLISH
4
CONTENTS
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GUIDES
