Rega Osiris - Manuel (Page 9)

COOLING AND PROTECTION TECHNOLOGY
Ventilation
The heat produced by the Osiris amplifier is dispersed to the air via the case, particularly
from the heat sinks mounted on either side of the product. Please ensure the heat sink
section is always exposed to allow sufficient airflow to provide adequate cooling of the
amplifier. If the Osiris is driven at high volume for a long period, it will generate heat this
is entirely acceptable and as long as there is sufficient ventilation the amplifier will
continue to work quite normally. Never place the amplifier on carpet, rugs, bedding or
other hi-fi equipment or cover the heat sinks.
Thermal Cut-Out
If the amplifier reaches a temperature liable to cause internal electronic damage a
thermal protection sensor will shut the unit off. If this occurs there will be no sound
emitted from the speakers. The unit should be turned off for at least 30 minutes to allow
for cooling, After this period, the amplifier should automatically reset and continue to
work normally. If it does not, turn off for several hours before retrying. The thermal
cut-out should only occur with continuous driving of a difficult load. If it occurs under
normal conditions, there could be a problem with one of the components of your system,
or insufficient air flow around the unit.
Protection
The Osiris amplifier has a fully protected output stage, with DC, electronic thermal
protection and Load-line protection. Like the input switching this circuit is supplied from a
dedicated power supply. The DC protection will activate within milliseconds, protecting any
connected device. All the protection circuits are so designed that they are peripheral to
the signal path and not influencing the sonic qualities of the Osiris in anyway.
Short Circuit Protection
In the event of a speaker lead short, the load-line short circuit protection will guard the
output stage from excessive currents and voltages. This Rega protection circuit is not
placed in the audio signal path and therefore does not affect sound quality.
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