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
EF500P’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 EF500P 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 EF500P 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 EF500P 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 EF500Ps). If desired, you
can combine a pair of the EF500P’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
EF500P Active Full Range Loudspeaker
Using the popular élite EF508 as a base, adding 800 Watts of bi-amped power and topping-it-
off with advanced signal processing, the EF500P 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 woofer. To reduce the overall weight of the amplifier section, the woofer amplifier
uses Class D switching technology. A 150 Watt, two-tier linear technology, Class H amplifier drives
the 2 inch titanium 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.
