Special Features - Amate Audio Joker Active Systems Manual De Usuario

Joker Active systems
Audio Settings
• Preset: FLAT
• Gain: 0.0dB
• Delay: 0m
• Mute: Off
• Polarity: Positive (Pol+) (only in subwoofers)
User settings:
• Front LED: Off when Limiting
• Backlight: Off after 30 seconds of no activity
• ECO Mode: Off
• ALC Mode: Auto (for models with ALC)
• Keypad Lock: 30s MENU+SELECT
• Language: English

4.5 Special Features

a) RMS Limiter
Joker systems combine a carefully designed dual limiter system to independently
protect each transducer against power overload: a peak Limiter and a RMS Limiter.
The RMS Limiter prevents long term exposition of the transducer to high RMS levels
(abnormal when the music has a correct dynamic headroom). When the limiter led
lights up continuously, it means that the RMS limiter is active. On the other hand, the
Peak Limiter has an ultrafast attack to control the highest peaks of the music and
only makes the Led blink.
Thanks to the large experience of Amate Audio on DSP algorithms and limiters,
these limiters are highly effective but yet unnoticeable for the listener.
b) Automatic Temperature Limiter
Under normal operation, Joker 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.
c) Input Overload Protection
Joker systems have a nominal input voltage of +8dBu / 2V (+2dBu / 1V in
subwoofers) for full power performance; nevertheless, in order to respect the highest
dynamics of the music, the input is capable to hold a high input voltage (+20dBu /
8V). This avoids undesirable effects from sound sources and mixers capable of
delivering a higher output voltage.
It must be noticed 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
35
Oct 2015
Amate Audio