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MD Powered Series Loudspeakers
Dimensions
qscaudio.com
Specifications subject to change without notice.
1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: 714/754-6174
MD Powered Spec Sheet 12/04/07
18"
457 mm
35"
889 mm
TopFrontSide Back
20.5"
521 mm
60°
Handles shown included
on black versions only
QSC’s PM series are the most
compact, lightweight and
efficient loudspeaker power
modules currently available.
They have been specifically
developed to meet the
headroom and voltage swing
requirements of high-end
professional loudspeaker
systems. The PM1000 features
two channels producing 800
watts (LF) and 200 watts
(HF) respectively, while the
PM1400 delivers 1400 watts
into a single channel.
Users familiar with existing powered speaker
technology expect to see a large heat sink,
taking up most of the speaker’s rear panel. Such
products run hot at full power, and may not
be capable of sustained high output operation
in all positions or climate conditions due to
thermal limitations.
The linear amplifier technology utilized in most
current powered loudspeaker designs is capable
of acceptable audio performance, but inherent
inefficiencies limit the maximum power of
these systems to the 300 to 500 watt range.
Multi-tier linear technology can extend this to as
much as 700 watts (as in QSC’s HPR speakers),
but still requires a large, heavy heat sink.
Existing amplifier technologies forced
compromises upon the loudspeaker designer
that QSC engineers found unacceptable. The
resulting specification called for an amplifier
package measuring no more than 4.4" x
14.6" x 7" (112 mm x 371 mm x 178 mm)
and weighing only 8 lbs (3.6 kg) yet capable
of continuously delivering double or triple
the amount of power traditionally feasible
in a package of this size. Our engineers
combined the lessons QSC has learned from
three generations of PowerLight technology
power supplies with a unique, patent pending
approach to “Class D” amplification to create
the PM series power modules.
Until now available Class D solutions have been
constrained by voltage limitations, and thus
remained below the 500 watt (at 8 ohms)
barrier, and many designs have also suffered
from imperfect audio quality. QSC has broken
through these barriers, with ratings exceeding
800 watts into standard 8 ohm loads, and 1400
watts into 4 ohms. Peak voltages can reach 120
volts, at up to 30 amps of current (3600 watts
of “peak power”). At the same time, advanced
internal error-correction keeps audio quality
pristine across the entire frequency range.
QSC has finally opened the door to combining
the horsepower potential of Class D with no
compromise audio performance.
For the MD powered models, speaker response
is fine-tuned with high order crossover slopes,
signal alignment and LF rolloffs as well as
multiple parametric equalizer sections. The
internal processing also includes long-term
power limiting, allowing higher levels of
amplifier drive to the speaker without damaging
overloads.
The PM modules are built on a solid aluminum,
three-sided extrusion that functions as a chassis,
heat sink and mounting flange. Because of
their high conversion efficiency, PM modules
normally dissipate only about 25 to 50 watts
of input power as heat, and are basically a
passively cooled design. However, in order
to keep the exposed surfaces within required
temperature limits, and prevent thermal
overload in extremely hot environments, a
temperature controlled fan is mounted to the
heat-sink assembly and comes on only when
heat sink temperature reaches 122º F (50 C),
ensuring that “the show goes on” even under
extreme conditions.
PM Power Modules
QSC and the QSC logo are registered trademarks of QSC Audio Products Inc. in the U.S. Patent and Trademark office and other countries. ModularDesign is a trademark
of QSC Audio Products Inc. All other trademarks are the property of their respective owners. *US Patent #7,279,967. Other patents may apply or be pending.