Filter
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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 combina-
tion of two-tier and
Class D amplification
has reduced extrane-
ous heat to the point
that NX55P’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 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 sweep-
ing filters. If the NX55P 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. Ex-
tremely fast and accurate
limiting is in place to protect
the speaker components.
As a bonus, the NX55P
has a built in mixer! This al-
lows the loudspeaker to be
used directly with a micro-
phone and/or line source. The
loop output allows additional active
cabinets to be driven from one source (up
to a maximum of 50 NX55Ps). If desired, you
can combine a pair of the NX55P’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 (opti-
mized 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 individ-
ually adjusted in level. This is invaluable in ap-
plications where large numbers of cabinets
are used such as in clusters or in trade show
applications (or when NX55P’s are used as
repeater cabinets or for side fill). The 100 Hz
high pass filters allow the NX55P to be used
more efficiently with any active subwoofer.
NX55P Active Full Range Loudspeaker
Using the popular nx20 as a base, adding 550 Watts of bi-amped power and topping-it-off with aad-
vanced signal processing, the NX55P is destined to set the new standard for active loudspeakers. The
woofer amplifier, or low frequency amplifier, amp delivers over 450 Watts 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 inch dia-
phragm 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.