DIGISYNTHETIC DP1800 User Manual - Page 3
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Installation & operating instruction
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
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.
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 amplifie : 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.
Handling.
Do not force knobs and connectors, as they could be damaged if treated with excessive
force.
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.
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 disperse 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.
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 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 very small spaces which don't allow correct air
circulation.
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