QSC Audio MD-SP215 User Manual
MD Powered Series
ModularDesign™Subwoofers
Features of the MD Powered Series
•Useableoutputto24Hz
•Sixteen3/8"-16threadedattachmentpointsaddressall
suspensionrequirements
•Availableineitherblackorwhitefinishes
•Foambacked,powdercoated,heavygaugesteelgrille
Features of the Patented* PM1400 Power Module
•Provides1400wattsofcontinuouspower
•ClassDswitchingtechnology
•AcceptsbalancedXLRinputconnectorwithpass-throughconnector
•Integratedactivecrossoverandequalizationelectronics
•Internallimiterspreventoverdrivingthesystem
The MD Powered Series subwoofers combine the
superb loudspeaker performance of MD Series
installation loudspeakers with the latest generation
of QSC’s amplification and signal processing
technologies. These models are designed to
complement the capabilities of MD Powered
full-range loudspeakers by extending frequency
response into and below the lowest octaves of the
audible range.
The MD-SP215 and MD-SP218 subwoofers
offer dual 15" or 18" front-loaded transducers,
respectively. Large centrally located vents with
radiused terminations eliminate port turbulence
and noise. Transducers feature technically advanced
4" voice coils assembled with proprietary high
temperature adhesives, vented ceramic magnet
assemblies and highly optimized motor design
to provide high linear excursion, low power
compression, flat frequency response and a very
low distortion figure.
Both models feature the PM1400 Power Module,
which offers state-of-the-art integration of
amplification and signal processing. See the rear
page of this specification sheet for further details.
MD Powered Series subwoofers offer exceptional
performance in a wide variety of applications,
including houses of worship, performing arts
facilities, hotels, casinos, night clubs, and sporting
facilities. For design/build contractors and
electroacoustic design consultants, MD Powered
Series subwoofers offer an effective solution to the
myriad of challenges encountered in the design
and implementation of permanently installed
sound reinforcement systems.
Specifications
MD-SP215 MD-SP218
Configuration Two 15" long-throw woofers Two 18" long-throw woofers
with 4" voice coils, aluminum with 4" voice coils, aluminum
demodulating ring demodulating ring
Frequency Response (-6 dB) 27 Hz - 100 Hz 26 Hz - 100 Hz
Frequency Range (-10 dB)
Maximum Output
Continuous1 129 dB 131 dB
2
Peak
Amplifier Module
Power Output 3 1400 W
Input Sensitivity 1.2 Vrms (+4 dBu)
Input Clipping 7.5 Vrms (+19.5 dBu)
Input Impedance (Ω) 20k
Input Connector Balanced XLR female (Pin 1: Ground, Pin 2: +, Pin 3: -)
Output (loop-thru) Connector XLR male wired in parallel with input
Controls Gain control, 100 Hz high-cut filter, Power on/off
Indicators Clip/Limit (red LED) / Signal (green LED) / AC Power (blue LED)
Protection Thermal limiting, on/off muting, AC inrush current limiting (< 12 A peak)
Operating Voltage Available in 120 V or 230 V (+15% / -40%)
AC Power Requirements 4
Pink Noise (6 dB crest factor) Idle < 0.5 A (< 100 BTU waste heat) / 1/8 power 2.5 A (570 BTU waste heat) /
1/3 power 5.0 A (1380 BTU waste heat) / Full Power 15.0 A (4010 BTU waste heat)
Typical Program Material 2.5 A (570 BTU waste heat)
at Full Power
Enclosure
Suspension Points 16 load-rated attachment points that accept 3/8"-16 threaded hardware
Finish Wear resistant textured paint, available in black and white (handles on black only)
Grille Powder-coated perforated steel
Dimensions (HWD) 26" x 40" x 23.3" 28" x 48" x 24"
(660 mm x 1016 mm x 591 mm) (711 mm x 1219 mm x 610 mm)
Weight 190 lb (86.2 kg) 210 lb (95.3 kg)
All amplifiers are FCC class B (conducted and radiated emissions), UL/CE listed
1) Calculated based on sensitivity and continuous amplifier power at onset of limiting
2) Calculated based on sensitivity of transducers and peak output capability of amplifier
3) The maximum sustained power at less than 1% clipping, averaged over the intended frequency range
4) Current values are for 120 V, for 230 V operation divide by 2
25 Hz - 110 Hz 24 Hz - 110 Hz
135 dB 137 dB
MD-SP215 | MD-SP218
MD Powered Series Subwoofers
MD-SP215 MD-SP218
SideFront
Front
Dimensions
Side
26"
660 mm
40"
1016 mm
Handles shown included
on black versions only
Back
PMSeriesPowerModules
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
28"
711 mm
23.3"
591 mm
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
48"
1219 mm
Back
24"
610 mm
Handles shown included
on black versions only
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.
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
MD Powered Subs Spec Sheet 12/04/07
qscaudio.com
Loading...