QSC Audio MD-FP122/66 MD Powered Series Loudspeakers, Dimensions, Side, Back, PM Power Modules

MD Powered Series Loudspeakers Dimensions

Side Front

35"

889 mm

20.5"

521 mm

Back Top

18"

457 mm

60°

Handles shown included on black versions only

PM Power Modules

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.

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.

1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: 714/754-6174 qscaudio.com

MD Powered Spec Sheet 12/04/07