9
Note: even if the digital LIMITERS can work with
extreme precision and effi ciency, it’s always advisable
to avoid too high signal levels and to prevent the LIMIT
LED to blink
- LONG TERM POWER PROTECTION: this protection
acts when the T4A is used continuously at the
maximum power allowed for each loudspeaker. The
digital processor is able to detect if one of the system’s
loudspeaker is reaching the maximum temperature
allowable for its voice coil. In this case, the output signal
(and, consequently, the power applied to that speaker)
is slowly reduced in order to take back the system within
safety limits. The power reduction is maintained until the
critical condition remains. As soon as a normal working
condition is restored, the power is gradually taken back
to the nominal level. This protection, which is completely
automatic and doesn’t affect the dynamic performance
of the system, is able to prevent damages to the
speakers when the T4A is used in extreme conditions.
- LFC (Low Frequency Control): this is a frequency-
dependent compressor able to perform an additional
protection over a limited frequency band where the
woofer is more liable to be damaged by excessive
power.
9. How the PLUGINS work
- NOISE GATE: it’s a dynamic fi lter able to eliminate the
background noise coming from the devices connected
to the enclosure input. The NOISE GATE fi lter is active
on the fi rst group of eight PRESETS of T4MA.
- ANTI-FEEDBACK: it’s a system able to identify
feedbacks and automatically reduce them by means of
10 notch fi lters. The 10 notch fi lters operate in SINGLE
mode, meaning that once they have been placed on a
certain frequency they remain on that frequency. All the
fi lters are reset every time the T4MA is switched off and,
when it is switched on, they can be activated again if
some feedback frequency comes out.
The ANTI-FEEDBACK PLUGIN is active in the STAGE
MONITOR and MIC PLUG&PLAY PRESETS. To make
the most of it we suggest to follow this procedure:
a. place the speakers and the microphones in their
usual positions;
b. raise slowly the microphone’s volume until the
feedbacks are produced by the speakers: the
system will place the notch filters on the feedback
frequencies;
c. if needed, move the microphone all around the area
where they will be used;
d. take back the microphone’s volume at its normal
level.
Now the notch filters have been placed on the
frequencies where the feedbacks are more likely to
appear and, therefore, in case the microphone level
is raised during the performance, they will be able to
reduce them.
ATTENTION!!!
The T4MA’s ANTI-FEEDBACK in not able to eliminate
completely the feedbacks, but it can reduce the risk
that they happens during a performance. This allows
the use of the system at a higher level than usual
and also in critical conditions as, for example, with
the microphones placed in front of the speakers or
with moving microphones.
The ANTI-FEEDBACK PLUGIN is active on the eight
PRESETS of the second group marked with the AFB
abbreviation.
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