Dynacord H 2500 Owner's Manual page 34

PowerH SERIES
The power amplifier automatically re-starts after approximately 20 minutes. As an alternative, re-starting
the power amplifier manually using the mains switch or via IRIS-Net™ is also possible, if the device has
cooled down sufficiently.
HF-Limiter
If the power amplifier processes high-frequency signals at high levels, amplification is automatically
reduced after a while to protect the output stages against damage. Most of the time such conditions result
from a malfunction in one of the devices that are connected upstream in the signal chain. The situation
becomes particularly critical for power amplifier and connected tweeter cabinets when the signal is still in
the audible range or just above the auditory threshold. Conventional HF-Protection circuits are not
sensitive enough to react within this particular range, since they are primarily targeted at detecting fault
conditions of the power amplifier itself.
Next to conventional HF-Protection, PowerH SERIES amplifiers have also a HF-Limiter, which is
frequency-dependent and permanently monitors the output signal. The HF-Limiter possesses the ability to
reliably differentiate between normal reproduction of music and speech and critical operating conditions.
The power amp's signal amplification is automatically reduced whenever such a critical operating condition
occurs.
34 Owner's Manual