QSC Audio MD-SP215 - Manual (Page 2)

MD Powered Series
Subwoofers Dimensions
qscaudio.com
1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: 714/754-6174
MD Powered Subs Spec Sheet 12/04/07
Side Front
Back
Front
Back
Side
26"
660 mm
40"
1016 mm
23.3"
591 mm 24"
610 mm
48"
1219 mm
28"
711 mm
MD-SP215 MD-SP218
Handles shown included
on black versions only 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 - 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 lb (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 Series 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 Series 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 Series 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 (50º C), ensuring that “the show goes
on” even under extreme conditions.
PM Series Power Modules
Specifications subject to change without notice.
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.