Dynacord X 1202, Руководство пользователя

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Mounting
The X-Amp Series power amplifiers are designed to be mounted in a standard 19" rack frame. To ensure
a trouble-free operation, make sure to provide sufficient ventilation. In an open rack system, mounting
several power amps directly on top of each other is possible. Despite the comparably light weight of the
X-Amps, only connecting them via front panel screws is not recommendable. Horizontal rack mounting-
rails or optionally available rack ears (for 15.5" or 18" depth) provide additionally stability and guarantee
a secure mounting.
Cooling
The cooling system of the X-Amp Series power amplifiers is designed to provide front-to-rear air circulation
where fresh air enters the front ventilation louvres and warm air is blown out at the rear of the appliance.
This is accomplished through the use of temperature-controlled 3-stage internal fans. Therefore, under
no circumstance block the ventilation louvres on the front and the rear of the appliance. When powering
on the amplifier, the fans start running with full speed. After a few seconds, they automatically gain their
appropriate, temperature-related speed. If, during normal operation, the fans are constantly running at
maximum speed or even the power amp’s thermal protection is activated, improving the air circulation
inside the rack system is recommended.
Under extreme operational conditions, with loads lower than 4 ohms and continuously high output, or
when the amplifiers are installed in a closed rack system like it is often the case in permanent installation
applications, to provide additional cooling employing an external rack cooling-system. Sufficient air
circulation has to be guaranteed at all times.
Mains power
When shipped from the factory, the X-Amps are already set to the correct mains voltage. Nevertheless,
please make sure that the labeled operation voltage correlates to your local mains supply voltage. The
X-Amp Series power amplifiers are designed to provide trouble-free operation even at mains under
voltages of -30%. Optional performance is guaranteed in a range between -10% and +6%. Please, use
only the supplied mains cord for connection.
Cabling
Particular attention should be paid when choosing the loudspeaker cable. Depending on the degree of
modulation, power amplifiers of this dimension produce comparably high output currents. The quality of
the loudspeaker cable and the plugs should correspond. The cables should be at least 2.5mm2 in
diameter. Lower diameters and longer cables result in higher impedance and therefore the loss of output
power. Using low-diameter or extremely long cables leads to unnecessary reduction of the excellent
damping factor of the power amplifiers, which amongst other things is a standard for the clean and
unconstrained reproduction of low-frequency signals.
Please, make sure to use only high-quality shielded cable with two separate signal-carrying conductors
for the connection of audio signal sources to the power amplifier inputs. Using balanced connection is
recommendable to prevent the introduction of interference and noise at the power amplifier’s input. It is
further advisable to run the source input cables apart from speaker and mains cables.
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