Specifications

SC-433 Cinema Loudspeaker System
Pr
eliminary Specifications
SC-433
Key Featur
es:
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 three-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 fr
equency 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 Hertz to 250 Hertz. 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 enclosur
e.
g
Thr
ee-way selectable, bi or tri-
amplified screen channel system
g
MH-1075 provides 90° horizontal x +20°
to -30° vertical coverage
g
LF-4315 is constr
ucted of MDF and
features single woofer chambers
g
Low-distortion waveguides provide
highly articulate dialogue
g
Shallow depth (20") facilitates installation
90° horizontal x +20 to -30° vertical
32-16 kHz (-6 dB)
250 & 1700 Hz, 24 dB per octave
Specifications
Nominal Coverage
Frequency Range
Crossover Frequency
Impedance
Sensitivity 1 watt/1 meter,
half space
Maximum Input Power
(8 hours of 6db crest factor
IEC 268 noise spectr
um)
(2 hours of 6db crest factor
pinknoise, 50 - 20,000 Hz,
AES method)
Recommended Amplifier Power
Recommended Processing
Connectors
Transducers
Enclosure
Dimensions
Net W
eight
System Weight
Baffle Cut-Out
SC-433
LF-4315
5.5 ohms
99.5 dB
[1]
1200 watts RMS
1500 watts RMS
2400 watts RMS maximum
Subsonic filter below 30 Hz,
>18 dB per octave
Bar
rier strip scr
ew terminals accept
up to #10 AWG stranded wire, four
terminals-two inputs, two parallel
outputs
Three 15" (381mm) high efficiency,
extended bass woofers featuring
4" copper voice coils
Quasi B4 alignment, por
ted
enclosur
e with fully flar
ed ports,
symmetrical port design, tuned to
36 Hz, constructed of MDF and
heavily braced. Featur
es vandal
resistant woofer mounting bolts
30" wide x 53" high x 20.3" deep
(762mm x 1344mm x 516mm)
260 lbs/118 kg
MH-1075
8 ohms
Bi-amp Tri-amp
105dB MF 105dB HF107.5dB
[2]
350 watts RMS
800 watts RMS maximum
4th order LR crossover at 250 & 1700
Hz via QSC DCM or QSControl.net
Barrier strip screw terminals accept
up to #10 AWG stranded wire
10" high ef
ficiency mid range,
1.5" (38mm) exit, 3" titanium
diaphragm compression driver
Tilt/Pan Bracket
±10° vertical tilt
±
10
°
horizontal pan
30" wide x 39" high x 20" deep
(762mm x 990mm x 508mm)
85 lbs/39 kg
[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.
345 lbs/157 kg
93" x 32"
250 watts
RMS
passive
mid-high
275 watts
RMS
80 watts
RMS