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PowerH SERIES
Owner’s Manual 31
IRIS-Net
The IRIS-Net-LED lights blue if an IRIS-Net™-compatible remote control module has been installed in the
power amp’s extension slot and successful data communication has been established. The IRIS-Net-LED
blinks slowly whenever the “Find” function in IRIS-Net™ is being used to locate a power amplifier in the
rack. All other LEDs are deactivated during this time.
3.4 Fan Cooling
The power amplifier has two fans on the front and one on the rear. The fans are switched in five
performance-optimized levels, i.e. they are not running permanently but the running speed of each fan is
individually controlled depending on the ambient temperature. That in return ensures very silent running
during idle state. The temperatures of the power amp’s two channels and of the power supply unit are
registered and monitored separately. The intelligent and processor-controlled fan-control activates a fan to
run exactly at the level that is needed to cool down the corresponding components. This concept
effectively prevents the needless "rev up" of the fans when in idling state as well as the occurrence of a
thermally balanced condition, which causes permanent noise-intensive running of the fans. In other words,
the fans are activated only when it is really necessary because of thermal conditions. During power-on of
the amplifier, all fans run for a short period of time to verify the correct functioning.
3.5 Air Filter
An unrestricted airflow inside of the power amplifier is important for trouble-free operation. This is achieved
through conducting the airflow through cooling tunnels. This optimized routing of airflow has the effect that
in most cases the installation of air filters is not necessary. Installing air filters is only recommended when
using the power amp in an environment where dust exposure is excessively high. With air filters installed,
make sure to regularly check the filters for dust deposit and, if necessary, clean or replace them to protect
the power amplifier against thermal stress and consequently to prevent activation of the Thermal
Protection.