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CONTENTS
3
The EM120 is designed to be used with a professional power amplifier
capable of producing 400-500W 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.
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Connections are made via stripped wires to avoid the need for soldered
connectors. The EM120 enclosure is provided with a pair of 4mm screw
terminals.
The impedance of the EM120 is 8 ohms.
Note: It is important to maintain consistent polarity throughout i.e. Red to
Red, Black to Black.
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The basic system configuration for one EM120 and up to three EM15's is
shown in Fig 1. Up to three EM15's (each in 16 ohm configuration) are
wired in parallel with the input of the EM120, and driven from one channel
of the power amplifier. This arrangement presents a 3 ohm load to the
amplifier. Alternatively, one EM120 may be used with a single EM26,
presenting a 4 ohm load to the amplifier.
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AMPLIFICATION
CONNECTING TO AN AMPLIFIER
SYSTEM CONFIGURATIONS
Martin Audio – EM SERIES: EM120
3
GUIDES
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