Amate Audio NITID N18W, Руководство пользователя

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NITID N18W_N218W Oct 2017
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Amate Audio
4.7. Special DSP Features
4.7.1. RMS Limiter
NITID 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.
4.7.2. Automatic Temperature Limiter
Under normal operation, NITID 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.
4.7.3. Input Dynamic Compressor
NITID 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
damaging of the transducers and reduce their reliability. The
maximum power of
the system is obtained at its nominal input level. Under this condition, the limiter
LED may blink occasionally. Working continuously above this level is never
translated into better results.
To avoid loudspeaker damage because of input overload issues, NITID systems
build in an
input monitoring system that prevents the cabinet from being
continuously operated at excessive input signal levels .
After a period of exposure to high average input levels (over +2.5Vrms), a dynamic
compressor will
progressively reduce the output power , to protect the
transducers.
The higher the voltage at the input is, the higher the reduction of the output power,
being maximum reduction 18dB. While the dynamic compressor is active, the
LIMITER ON LED will blink constantly.