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3 AMPLIFICATION
The CS265 is designed to be used with professional power amplifiers
capable of producing 100-200W per channel 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.
4 SAFETY FIRST
It is important that loudspeaker systems are used in a safe manner.
Please take some time to review the following points concerning safe use
of Contractor Series loudspeakers.
Professional loudspeakers are capable of producing extremely high sound
levels and should be used with care. Hearing loss is cumulative and can
result from levels above 90dB if people are exposed for a long period.
Never stand close to loudspeakers driven at high level.
5 CABLE LENGTHS
When connecting loudspeaker systems to an amplifier, it is recommended
that the return resistance of the cable used is less than one tenth of the
nominal impedance of the system or systems in parallel. The table below
gives an indication of the maximum permissible cable runs for various
conductor cross-sectional areas.
Conductor CSA
Maximum Cable Run
4 ohms 8 ohms 16 ohms
1.0mm
2
11m 22m 44m
1.5mm
2
17m 34m 68m
2.0mm
2
22m 44m 88m
2.5mm
2
29m 58m 116m
4.0mm
2
44m 88m 176m
6.0mm
2
66m 132m 264m
Martin Audio – CS265
ENGLISH
3
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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