YORKVILLE NX750P Manuel De L'utilisateur page 3

NX750P Active Full Range Loudspeaker
Using the popular nx20 as a base, adding 750 Watts of bi-amped power and topping-it-off
with advanced signal processing, the NX750P is destined to set the new standard for active
loudspeakers. The woofer amplifier, or low frequency amplifier, amp delivers over 650 Watts to
the 15 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 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 dissipation. 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 reduced extraneous heat to the
point that NX750P's can easily be
used in any orientation
(close to walls, floors
and in close arrays
with multiple cabinets).
Competitive active
loudspeakers, with large
finned heatsinks, need to
be operated vertically
and with plenty of
clearance (to ensure
proper heat dissipation
and ventilation). Since
you have more versatility
in regards to the orientation
of the enclosure, the NX750P
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 overheating 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 NX750P is pushed to its maximum input/
output levels, advanced filtering begins
rolling off unnecessary subsonic frequencies.
The processing also protects individual
components ensuring failure free operation
(even after long term operation at close
to maximum output levels). The filter has a
remarkable response time, less then 70ms,
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. Extremely fast
and accurate limiting is
in place to protect the
speaker components.
As a bonus, the NX750P
has a built in mixer! This
allows the loudspeaker to
be used directly with a
microphone and/or line
source. The loop output
allows additional active
cabinets to be driven from one
source (up to a maximum of 50 NX750Ps).
If desired, you can combine a pair of the
NX750P's using the mixer inputs on each
cabinet and coupling the loop outputs.
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 NX750P's are used as repeater cabinets
or for side fill). The 100 Hz high pass filters allow
the NX750P to be used more efficiently with
any active subwoofer.
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