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compatible Martin Audio wall Brackets. The F8, F10 enclosures are 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 F8, F10, and S12 systems are designed to be used with professional
power amplifiers capable of producing the following power outputs into 4
ohms:
F8 200 – 600 W
F10 400 – 650 W
S12 400 – 800 W
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 F8, F10, S12
ENGLISH
6
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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