10
09. LEM INDOOR SW: this is the LEM INDOOR
PRESET with a 100Hz high-pass filter for the use
of the d400 with the LEM sub-woofer T5SA.
10. LEM OUTDOOR SW: this is the LEM OUTDOOR
PRESET with a 100Hz high-pass filter for the use
of the d400 with the LEM sub-woofer T5SA.
11. FLAT SW: this is the FLAT PRESET with a 100Hz
high-pass filter for the use of the d400 with the
LEM sub-woofer T5SA.
12. ENTERTAIN SW: this is the ENTERTAIN
PRESET with a 100Hz high-pass filter for the use
of the d400 with the LEM sub-woofer T5SA.
13. MAX LOUD SW: this is the MAX LOUD PRESET
with a 100Hz high-pass filter for the use of the
d400 with the LEM sub-woofer T5SA.
14. CD PLAYER SW: this is the CD PLAYER
PRESET with a 100Hz high-pass filter for the use
of the d400 with the LEM sub-woofer T5SA.
15. WALL MOUNT SW: this is the WALL MOUNT
PRESET with a 100Hz high-pass filter for the use
of the d400 with the LEM sub-woofer T5SA.
16. MIC PLUG&PLAY: this PRESET can be used
when you connect a dynamic microphone directly
to the d400 input. The equalization contained in
this PRESET allows to get from the microphone a
brilliant and intelligible response even without
using a mixer. In addition the use of the ANTI-
FEEDBACK plugin allows the feedback
phenomena to be reduced to the minimum (see
the ANTI-FEEDBACK section).
8. The protection system
The DPPM module includes a series of digital
algorithms that allows very high level of protection of
the speakers and the amplifiers to be achieved (see fig.
2).
- PEAK LIMITERS: they are able to avoid with extreme
precision the amplifier’s clipping and, at the same time,
to control the maximum peak power sent to the
loudspeakers. The SIGNAL/LIMIT LED on the module’s
panel lights (RED color) when the LIMITERS are active.
Note: even if the digital LIMITERS can work with
extreme precision and efficiency, 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 d400 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 d400 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
- MULTICOMP: it’s a multiband compressor made of
two separate compression units able to operate on two
user-selectable frequency bands (HIGH and LOW). The
MULTICOMP is used in some of the d400’s PRESETS
for the system’s dynamic EQ, to obtain loudness effects
or to apply an additional protection on defined frequency
bands.
- NOISE GATE: it’s a dynamic filter able to eliminate
the background noise coming from the devices
connected to the enclosure input. The NOISE GATE
filter is active on all the d400’s PRESETS (with the
exception of the STAGE MONITOR and MIC
PLUG&PLAY PRESETS).
- ANTI-FEEDBACK: it’s a system able to identify
feedbacks and automatically reduce them by means of
10 notch filters. 7 of the 10 available notch filters
operates in SINGLE mode, meaning that once they
have been placed on a certain frequency they remain
on that frequency until the RESET button is pressed.
The remaining 3 filters operate in AUTO mode and,
therefore, once they have been placed on a certain
feedback frequency, every time a new one is identified
by the system, they move from the original one to the
new one. All the filters are reset every time the d400 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;
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