LEM AMP SERIES, Руководство пользователя, Страница: 19 / 31

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AMP SERIES
Installation & operating instructions
Installation & operating instructions
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Mains Power Connection.
Before connecting the amplifier to the mains power socket, make certain that the voltage
corresponds with that indicated on the rear of the unit (an allowance of ±10% is
acceptable).
Before connecting the power cable to the mains, always make certain that it is not damaged
and that there are no bare wires. Always connect the power cable to the amplifier before
switching it on and only remove the cable after switching it off.
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Switching on and off.
In an audio system, it’s always better to switch power amplifiers on last and off first.
Remember to switch off the amplifier before connecting it to or disconnecting it from other units and to
switch always on first the mixer and then the amplifier: in this manner, peaks which are annoying and
sometimes dangerous particularly for the loudspeakers enclosures are avoided.
It is normal for the LEDs to light up for a few moments when switching on.
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Handling.
Do not force knobs and connectors, as they could be damaged if treated with excessive force.
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Connections and prevention of possible interference.
Avoid installing your equipment near radios, televisions, etc., since they could cause noisy disturbance. When
connecting the other units in your sound system, watch out for to so-called earth-loops, which can cause
hum: in the event of interference, try using the EARTH switch on the amplifier’s rear panel
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Connector cables.
To connect the amplifier to the mixer, always make certain to use only signal cables (screened cables
made up of two wires plus a braid screen), not power cables (speaker cables, normally made up of two
wires, usually with a greater cross-section): to connect the amplifier to the loudspeaker enclosures, always
use power cables , not signal cables , as in the latter case in fact, the power from the amplifiers would
be partially dispersed because of the cable’s smaller cross-section.
Take care of the connector cables. Always hold them by the connectors, avoiding pulling the wire and avoid
knots and twists when coiling them: this gives the advantage of increasing their life and reliability.
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Air circulation for cooling.
Amplifier’s correct cooling is ensured by an internal fan, the speed of which is controlled by a special sensor
(the speed is proportional to the output power and therefore the temperature generated): remember never
to block the air vents located on the unit’s sides in any way: the air necessary for cooling passes through
these.
If the amplifier is kept in a flight-case during use, make certain that it has sufficient openings at both the
amplifier’s air vents. Avoid locating it in very small spaces which don’t allow correct air circulation.