QSC SC-434 User manual
Developed specifically for the unique requirements
of professional motion picture playback, the SC-434
extends QSC’s commitment to the cinema market. As
a member of the DCS Digital Cinema Speaker Series,
the SC-434 is a 4-way, selectable tri or quad-amplified
screen channel loudspeaker system comprised of two
main units–the MHV-1090 high-frequency system and
the LF-4315 low-frequency system.
The MHV-1090 mid-high-very high system features a
high output, horn loaded 10" midrange cone driver
and a coaxial neodymium high-frequency/very high-
frequency compression driver. The MHV-1090 includes
a driver protection network and a passive crossover for
tri-amp operation. The protection circuitry prevents low-
frequency signals from damaging the high-frequency
and very high-frequency driver. 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 coaxial neodymium high-frequency/very high-
frequency compression driver provides a dramatic
improvement in dynamic response, clarity and
transparency. The annular high-frequency diaphragm
covers the frequency range between 1800 and 7000
Hz with a smooth, linear response. The large diaphragm
excursion of +/-0.8 mm results in high output and
increased power handling. The very high-frequency driver
covers the frequency range from 7000 to 22,000 Hz and
eliminates the dome break up of conventional drivers that
can cause resonance and harsh, metallic sound.
The LF-4315 triple 15"(381 mm) 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-434 is designed for ease of installation. The
MHV-1090 components come pre-assembled to reduce
field assembly time. Three bolts are all that are required
to secure the MHV-1090 to the top of the LF-4315
enclosure.
SC-434
Cinema Loudspeaker System
Features
• 4-wayselectable,triorquad-amplifiedscreenchannelsystem
• UniqueHF/VHFdiaphragmhaslessmassthantraditionaldiaphragmsresultingin
exceptionaldynamicrange,extendedhigh-frequencyresponseandlowerdistortion
• LF-4315isconstructedofMDFandfeaturessinglewooferchambers
• Low-distortionwaveguidesprovidehighlyarticulatedialogue
• Shallowdepth(20")facilitatesinstallation
• THX™approvedforprofessionalcinemaapplications
NEW!
Specifications SC-434
Nominal Coverage 90° horizontal x +20 to -30° vertical
Frequency Range (-6 dB) 33 – 20 kHz
Active Crossover Frequencies 250, 1700 and 6000 Hz, 24 dB per octave
LF-4315 MHV-1090
Impedance 5.5ΩMF: 8ΩHF: 8ΩVHF: 8Ω
Sensitivity 1 watt /1 meter,
half space
99.5 dB Tri-amp
MF:105 dB
HF/VHF: 110 dB
Quad-amp
MF: 105 dB
HF: 110 dB
VHF: 110 dB
Maximum Input Power1
8 hours of 6 db crest factor
IEC 268 noise spectrum
1200 W RMS MF: 275 W RMS
HF/VHF: 230 W RMS
MF: 275 W RMS
HF: 150 W RMS
VHF: 80 W RMS
2 hours of 6 db crest factor
pink noise, 50 Hz – 20
kHz,
AES method
1500 W RMS MF: 800 W RMS
HF/VHF: 500 W RMS maximum
Recommended
Amplifier Power
2400 W RMS maximum MF: 800 W RMS
HF: 500 W RMS
VHF: 300 W RMS maximum
Recommended Processing Subsonic filter below 30 Hz,
>18 dB per octave
4th order LR crossover at 250, 1700 and
6000 Hz via QSC DCM or QSControl.net™
Connectors Barrier strip screw terminals accept up to #10 AWG stranded wire
Transducers Three 15" (381mm) high
efficiency, extended bass
woofer featuring a 4" copper
voice coils
MF: 10" high-effeciency, horn-loaded cone
with pahse plug
HF/VHF: coaxial neodymium compression
driver with 3.5" (90 mm) HF diaphram
and 1.75" (44 mm) VHF diaphram
Enclosure Quasi B4 alignment, ported
enclosure with fully flared
ports, symmetrical port design,
tuned to 36 Hz, constructed
of MDF and heavily braced.
Features vandal resistant
woofer mounting bolts
Tilt/Pan Bracket
±10° vertical tilt
±10° horizontal pan
Dimensions (HWD) 53" x 30" x 20.3"
(1344 mm x 762 mm x 516 mm)
39" x 30" x 20"
(990 mm x 762 mm x 508 mm)
Weight – Net 260 lb (118 kg) 84 lb (38.5 kg)
System Weight 344 lb (155.5 kg)
1) Maximum input power tested in accordance with IEC 268-5 recommendations, 50 Hz – 20 kHz band limiting, 6 dB signal crest factor.
SC-434 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-434 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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