Start-Up And Operation - Master audio HD Serie Manual De Instrucciones

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8 - COOLING
The HD Series are equipped with electronically controlled forced ventilation, which is
carried out by two turbines situated at the rear panel, one in front of each power
module. According to the temperature, two different fan speeds are set, and the hot
air is evacuated through the front panel. It is very important to favour the good air
circulation to keep the equipment in a stable temperature work pattern; therefore any
possible obstruction must be avoided both in the rear and front part. In addition, an
installation close to heat generator sources or lack of ventilation must be avoided
(closed cabinets).
ATTENTION: As the forced air circulation (from the back to the front) can produce
the introduction of dust and dirtiness in general over the internal radiators, it is highly
recommended to make an internal cleaning operation at least once a year,
depending on the particular circumstances of each installation or use.
NOTE: Any deterioration of the amplifier caused by an evident presence of dirtiness
and/or internal humidity, will EXCLUDE of any right of application of the Warranty for
this product.

9 - START-UP AND OPERATION

Once the mains, loudspeaker and sound sources (input) connections have been
made correctly, start up the pre-amp sources and then press the ON/OFF switch.
Turn the volume controls clockwise to obtain the maximum gain.
The amplifier is equipped with a Soft Start circuit, which assures a gentle, pop free
start up, avoiding stress to the loudspeakers.
In order to obtain the maximum dynamic range from the amplifier, it is recommended
to set always the gain controls to the maximum, and control the output power by
regulating the signal level at the amplifier's input (using the corresponding mixer,
crossover, equalizer or processor gain control).
When the maximum output power has been exceeded in any of both channels
(clipping/distortion), this will be indicated by the corresponding led LIMITER, advising
that it is recommended to lower the general volume coming from the mixer our sound
source connected to that channel (previous crossover, equalizer, processor, etc.).
10 - CLIP-LIMITER CIRCUIT
This circuit prevents the amplifier from delivering distortion
at the loudspeaker outputs. Its action is practically inaudible
and protects the loudspeaker voice coils. A LED on the front
panel indicates the action of the anti-clipping limiter of each
channel. If the clip LED is lit intermittently, this may be
interpreted as correct, but it means that the amplifier is
reaching its maximum power at this point.
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