YORKVILLE NX55P Manuel De L'utilisateur page 3

NX55P Series Two Active Full Range Loudspeaker
Using the popular nx20 as a base, adding 1000 watts of bi-amped power and topping-it-off with
aadvanced signal processing, the NX55P Series Two is destined to set the new standard for active
loudspeakers. The woofer amplifier, or low frequency amplifier, amp delivers over 900 s to the 12 inch
neodymium woofer. To reduce the overall weight of the amplifier section, the woofer amplifier uses
Class D switching technology. A 100 watt, two-tier linear technology, Class H amplifier drives the 1.4
inch diaphragm horn driver. This allows the horn to produce clean transients while keeping up with
the high output of the woofer. Two-tier amplifier technology isn't typically seen in a product like this,
however we found the advantages (lower weight, more efficiency, higher headroom and lower
operating temperature) made it a perfect choice for powering the top end.
This combination of
Class D and Class H
amplifier technologies
helps keep distortion
to a minimum while
reducing the need
for massive heat dis-
sipation. In fact, to a
level low enough to
eliminate the need
for heavy heatsinks.
The advantage of this
unique combination
of two-tier and Class
D amplification has re-
duced extraneous heat
to the point that NX55P
Series Two's can easily be
used in any orientation (close to walls,
floors and in close arrays with multiple
cabinets). Competitive active loudspeak-
ers, with large finned heatsinks, need to be
operated vertically and with plenty of clear-
ance (to ensure proper heat dissipation and
ventilation). Since you have more versatility
in regards to the orientation of the enclosure,
the NX55P Series Two becomes ideal for flying
in large clusters and in point-source concert
sound systems. Yorkville's designers took extra
care making sure that in tight clusters over-
heating would not be an issue.
Taking advantage of the design process, an
opportunity was taken to tweak the electronics
for maximum overall speaker performance and
protection. Solutions were borrowed from our
high-end TX-Series PA systems. The limiters used,
at the input and crossover stages, are a complex
combination of gain reduction and sweeping
filters. If the NX55P Series Two is pushed to its maxi-
mum input/output levels, advanced filtering be-
gins rolling off unnecessary subsonic frequencies.
The processing also protects individual compo-
nents ensuring failure free operation (even after
long term operation at close to maximum output
levels). The filter has a remarkable response time,
less then 70 ms, allowing the system to constantly
be re-tuning itself. This makes sure the output is
as clean, as loud and as clear as possible at any
given moment. This is achieved
without negatively affecting
the overall sonic quality of
the cabinet. This ensures
that the essential part of
the mix, like the vocals
or solo instruments,
come out clean and
clear when the cabinet
is being operated at the
extremes of power and
woofer excursion. Ex-
tremely fast and accurate
limiting is in place to protect
the speaker components.
As a bonus, the NX55P
Series Two has a built in
mixer! This allows the loud-
speaker to be used directly
with a microphone and/or line
source. The loop output allows addi-
tional active cabinets to be driven from one
source (up to a maximum of 50 NX55P Series
Twos). If desired, you can combine a pair of
the NX55P Series Two's using the mixer inputs
on each cabinet and coupling the loop out-
puts. In this example you would have an ideal
presentation system. Two microphone inputs,
two line inputs (optimized for CD, Cassette or
laptop computer audio source), complete
within two speaker cabinets. As mentioned,
our active cabinets can be linked together,
the limitation is that only three 'mixers' can
be active at any one time. This allows three
Mic sources and six line sources available
in an array of three or more cabinets). The
microphone inputs have equalization and
high pass filtering designed appropriately for
vocal applications. The trim control allows
looped cabinets to be individually adjusted in
level. This is invaluable in applications where
large numbers of cabinets are used such as in
clusters or in trade show applications (or when
NX55P Series Two's are used as repeater cabi-
nets or for side fill). The 100 Hz high pass filters
allow the NX55P Series Two to be used more
efficiently with any active subwoofer.
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