Via Monti Urali, 29 – 42122 Reggio Emilia (Italy) • Telephone: +39 0522 557735 • [email protected]
Protection Characteristics
This power amplifier has a long service life thanks to its systems protecting the amplifier
and its charge.
Peak Limiter:
It is the last block in the DSP chain (see Figure 10): it is set to prevent the amplifier output
signal from exceeding the power peaks that special transducers used can handle. This
limiter abates the gain when a threshold is exceeded and it releases this abatement in a
brief time. The peak limiter is not disconnectable. Thresholds set on the different outputs
and in the different DSP presets are closely united to the special systems of cone
loudspeakers this amplifier was designed for, as specified below.
“RMS” Limiter:
It is an analogic limiter placed at the amplifier output with time of analysis and intervention
longer than the peak limiter. It works supplementarly to the peak limiter and it allows not to
exceed the thermal thresholds of power tight of transducers. Exceeding this threshold
would cause a proportionate decrease of the gain, that occurs in a hearable way in a few
seconds. The gain is reactivated in case of decrease of the input signal. RMS limiter is not
disconnectable. The threshold set is closely united to the special systems of transducers
this amplifier was designed for, as specified below.
Temperature and Power Value Protection:
This amplifier is supplied with sensors of temperature and it can measure the output
power. When one of these values exceeds an extreme value for a certain time, the system
protects itself by decreasing the gain. The persistence of the conditions of threshold
exceeding would cause the amplifier switch off. The trend of power and temperature
values and of all the protection interventions in the last three days of actual use is plotted
on a graph on the panel of software DSP control and it can be saved in a numerical
format, Figure 3.
Figure 3: Software of DSP control – Monitoring panel
