QSC Audio Speaker SC 433 User Guide

Cinema Loudspeaker System  
• 3-way selectable, bi or tri- amplified screen channel system  
• MH-1075 provides 90° horizontal by +20° to -30° vertical coverage  
• LF-4315 is constructed of MDF and features single woofer chambers  
• Low-distortion waveguides provide highly articulate dialogue  
• Shallow depth (20") facilitates installation  
• THXapproved for professional cinema applications  
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.  
Nominal Coverage  
Frequency Range  
90° horizontal x +20 to -30° vertical  
32 Hz – 16 kHz (-6 dB)  
Crossover Frequency  
250 and 1700 Hz, 24 dB per octave  
Sensitivity 1 watt/1 meter,  
half space  
99.5 dB  
105 dB  
MF 105 dB HF 107.5 dB  
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.  
Maximum Input Power1  
8 hours of 6 db crest factor  
IEC 268 noise spectrum  
1200 W RMS  
1500 W RMS  
250 W RMS2 275 W RMS 80 W RMS  
2 hours of 6 db crest factor  
pink noise, 50 Hz – 20 kHz,  
AES method  
350 W RMS  
Recommended Amplifier Power 2400 W RMS maximum  
800 W RMS maximum  
Recommended Processing  
Subsonic filter below 30 Hz,  
> 18 dB per octave  
4th order LR crossover at 200 and 1700  
Hz via QSC DCM or QSControl.net™  
Barrier strip screw terminals  
accept up to #10 AWG  
stranded wire  
Barrier strip screw terminals  
accept up to #10 AWG stranded wire  
Three 15" (381mm) high efficiency, 10" high efficiency mid range,  
extended bass woofer featuring  
4" copper voice coils  
1.5" (38mm) exit, 3" titanium  
diaphragm compression driver  
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.  
Quasi B4 alignment, ported  
enclosure with fully flared ports,  
symmetrical port design, tuned to 10° horizontal pan  
36 Hz, constructed of MDF and  
heavily braced. Features vandal  
Tilt/Pan Bracket  
10° vertical tilt  
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  
System Weight  
Baffle Cut-Out  
260 lb (118 kg) 85 lb (39 kg)  
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.  
345 lb (157 kg)  
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.  
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