QSC SC-433 User manual
Developed specifically for the unique requirements
of professional motion picture playback, the SC-433
extends QSC’s commitment to the cinema market. As
a member of the DCS Digital Cinema Speaker Series,
the SC-433 is a 3-way, selectable bi or tri-amplified
screen channel loudspeaker system comprised of two
main units—the MH-1075 high-frequency system and
the LF-4315 low-frequency system.
The MH-1075 mid-high system features a high
output, horn loaded 10"midrange cone driver and a
3"(75mm) titanium diaphragm compression driver
mounted to an adjustable pan and tilt bracket. The
MH-1075 includes a driver protection network and
a passive crossover for bi-amp operation. Power
limiter circuitry protects the high-frequency driver
from overpowering. The MH-1075 provides extended
frequency coverage for the critical midrange band. A
high power 10"cone driver allows operation as low
as 250 Hz and the advanced phase plug coupling
permits a crossover point of up to 1800 Hz to the
high-frequency horn. This ensures that most of the
dialog range is reproduced by a single element, for
unmatched intelligibility.
The LF-4315 triple 15"(381mm) low-frequency
enclosure is designed specifically to address the
extended low-frequency response required for cinema
applications. The LF-4315 covers the frequency range
from 35 Hz to 250 Hz. Close Coupled Woofers
(CCW), with their tight spacing between woofers,
improves coupling and keeps coverage angles wide
over a greater frequency range than more widely
spaced designs.
The SC-433 is designed for ease of installation.
The MH-1075 components come pre-assembled to
reduce field assembly time. Three bolts are all that
are required to secure the MH-1075 to the top of the
LF-4315 enclosure.
SC-433
Cinema Loudspeaker System
Specifications SC-433
Nominal Coverage 90° horizontal x +20 to -30° vertical
Frequency Range 32 Hz – 16 kHz (-6 dB)
Crossover Frequency 250 and 1700 Hz, 24 dB per octave
LF-4315 MH-1075
Impedance 5.5Ω8Ω
Sensitivity 1 watt /1 meter, 99.5 dB Bi-amp Tri-amp
half space 105 dB MF 105 dB HF 107.5 dB
Maximum Input Power1
8 hours of 6 db crest factor 1200 W RMS 250 W RMS2275 W RMS 80 W RMS
IEC 268 noise spectrum
2 hours of 6 db crest factor 1500 W RMS 350 W RMS
pink noise, 50 Hz – 20 kHz,
AES method
Recommended Amplifier Power 2400 W RMS maximum 800 W RMS maximum
Recommended Processing Subsonic filter below 30 Hz, 4th order LR crossover at 200 and 1700
> 18 dB per octave Hz via QSC DCM or QSControl.net™
Connectors Barrier strip screw terminals Barrier strip screw terminals
accept up to #10 AWG accept up to #10 AWG stranded wire
stranded wire
Transducers Three 15" (381mm) high efficiency, 10" high efficiency mid range,
extended bass woofer featuring 1.5" (38mm) exit, 3" titanium
4" copper voice coils diaphragm compression driver
Enclosure Quasi B4 alignment, ported Tilt/Pan Bracket
enclosure with fully flared ports, ±10° vertical tilt
symmetrical port design, tuned to ±10° horizontal pan
36 Hz, constructed of MDF and
heavily braced. Features vandal
resistant woofer mounting bolts
Dimensions (HWD) 53" x 30" x 20.3" 39" x 30" x 20"
(1344 mm x 762 mm x 516 mm) (990 mm x 762 mm x 508 mm)
Weight – Net 260 lb (118 kg) 85 lb (39 kg)
System Weight 345 lb (157 kg)
Baffle Cut-Out 93" x 32"
1) Maximum input power tested in accordance with IEC 268-5 recommendations, 50 Hz – 20 kHz band limiting, 6 dB signal crest factor.
2) Maximum input power tested in accordance with IEC 268-5 recommendations, 200 Hz – 2 kHz band limiting, 6 dB signal crest factor.
passive
mid-high
Features
• 3-wayselectable,biortri-amplifiedscreenchannelsystem
• MH-1075provides90°horizontalby+20°to-30°verticalcoverage
• LF-4315isconstructedofMDFandfeaturessinglewooferchambers
• Low-distortionwaveguidesprovidehighlyarticulatedialogue
• Shallowdepth(20")facilitatesinstallation
• THX™approvedforprofessionalcinemaapplications
SC-433 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
SC-433 Spec Sheet – 06/20/08
Top
Side
21.7"
551 mm
20.3"
516 mm
30"
762 mm
Front
92"
2337 mm
36"
914 mm
39"
990 mm
53"
1346 mm
4"
102 mm
QSC, the QSC logo and QSControl.net are registered trademarks of QSC Audio Products, LLC in the U.S. Patent and Trademark office and other countries.
THX is a trademark of THX Ltd. All other trademarks are the property of their respective owners. Patents may apply or be pending.
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