Special Features - Amate Audio KEY Serie Manual De Usuario

KEY Active systems Sep 2018

4.5 Special Features

Automatic Temperature Limiter
Under normal operation, KEY amplifiers are able to perform during many hours at full
power. However, should the temperature in the amplifier rise abnormally, the system
will automatically adjust the limiter threshold to try to compensate for the temperature
raise. The system will progressively lower the output gain.
When the temperature lowers again, the system will recover its normal operation.
Should the temperature continue rising and reach 90ºC at the amplifier's heatsink,
the system will shut down in Protection mode.
Input Overload Protection
KEY systems are equipped with a high range input (+20dBu – 8V), but still there are
sound sources and mixers capable of delivering a higher output voltage.
It must be notice that driving a system continuously over its nominal input level
may drastically decrease the sound quality, normally because of the lack of
headroom (dynamic response). In the long term, it might also produce unnecessary
aging of the transducers.
Also the maximum power of the system is obtained at its nominal input level,
and working above it does not translate into better results.
KEY Systems are equipped with an input monitoring system that will prevent the
cabinet from being continuously operated at excessive input signal levels. After a
long period (more than 5 minutes) of exposure to high input levels, the cabinet will
enter in Input Overload Protection mode, meaning that:
- The output signal will be reduced by
20dB
- All leds on the back panel will be lit
- The front power led will blink
- The keypad will be locked
- A message will be shown in the LCD
(Input Overload)
To recover the normal operation mode, the input level should be reduced below
+5dBu (1.4V). After the level reduction, the system needs around 10 seconds to
recover the normal operation mode
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