X-Treme Audio XTDT - Manual (Page 11)

XTDT AMPLIFIERS
7. Protection features
All professional X-Treme amplifiers are equipped with strong pro-
tection systems to safeguard the amplifier and its load. These pro-
tection systems ensure the power amplifier a long operating life.
7.1 Limiter
When the limiter is ON the CLIP/LIM LED lights up. With the limiter
action the channel gain will automatically lower to protect the load
(loudspeaker systems) from damage caused by signal distortion.
It is not possible to disable the limiter circuit.
7.2 Thermal protection
The temperature state of the dissipator is constantly checked, the
HI-Temp LED gives indications on the temperature status. The Hi-
Temp starts flashing if the dissipater reaches a temperature of 60º
C. In such case the input signal of the relevant channel will be
automatically decreased until the correct running temperature is
reached. If the Hi-Temp LED stops flashing and the light remains
on (anomalous working condition) the whole system will go to
mute until the temperature reaches normal levels.
7.3 Power safety check
On X-Treme amplifiers the output current is constantly checked as
well as the input signal condition. If the current exceeds the maxi-
mum allowed level, output tension will be automatically readjusted
in order to assure the amplifiers safety status.
Power safety control acts especially in case of connection to a
load with impedance lower than the recommended levels or if at
the amplifier’s output a non acoustic signal is released during long
periods of time.
7.4 DC protection
If a value higher than or equal to 7 V occurs, the presence of a DC
on both channels will be monitored indipendently, and the ampli-
fier output stage and the switching supply will be blocked. This
allows loudspeaker protection from the DC.
7.5 Absorption limitation
The X-Treme power amplifiers are equipped with a soft-start sys-
tem to reduce the absorption when switched on. This feature is
particularly useful in multiple amplifier installations.
7.6 Power supply protection
The AC voltage is monitored; if its value does not fall within the
correct running range (over or under voltage) the supply will be
automatically blocked. The amplifier will restart when the main
supply voltage exceeds the minimum running tension or is under
the maximum running voltage.
7.7 Switch-on/turn-off transients
A mute circuit (without relay), with a delayed starting up and im-
mediate power turning off, has been introduced in order to avoid
the switch-on/turn-off transients that may cause damage to the
loudspeakers.
7.8 Maintenance information
Please contact the nearest X-Treme Assistance Service (Distribu-
tor or Dealer) or directly X-Treme Audio for maintenance assist-
ance.
X-Treme “After Sales Service”
Via Monti Urali, 33
42100 Reggio Emilia (Italy)
Tel. +39-0522-557735
Fax +39-0522-393733
E-mail: [email protected]
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