QSC Audio Speaker SC 434 User Guide

NEW!  
Cinema Loudspeaker System  
SC-434  
Features  
• 4-way selectable, tri or quad- amplified screen channel system  
• Unique HF/VHF diaphragm has less mass than traditional diaphragms resulting in  
exceptional dynamic range, extended high-frequency response and lower distortion  
• 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-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.  
SC-434  
90° horizontal x +20 to -30° vertical  
Specifications  
Nominal Coverage  
Frequency Range (-6 dB)  
Active Crossover Frequencies  
33 – 20 kHz  
250, 1700 and 6000 Hz, 24 dB per octave  
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.  
LF-4315  
MHV-1090  
MF: 8Ω HF: 8Ω VHF: 8Ω  
Impedance  
5.5Ω  
Sensitivity 1 watt/1 meter,  
half space  
99.5 dB  
Tri-amp  
Quad-amp  
MF:105 dB  
HF/VHF: 110 dB  
MF: 105 dB  
HF: 110 dB  
VHF: 110 dB  
Maximum Input Power1  
8 hours of 6 db crest factor 1200 W RMS  
IEC 268 noise spectrum  
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 1500 W RMS  
pink noise, 50 Hz – 20  
MF: 800 W RMS  
HF/VHF: 500 W RMS maximum  
kHz,  
AES method  
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.  
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  
Transducers  
Barrier strip screw terminals accept up to #10 AWG stranded wire  
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  
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.  
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"  
39" x 30" x 20"  
(1344 mm x 762 mm x 516 mm) (990 mm x 762 mm x 508 mm)  
260 lb (118 kg) 84 lb (38.5 kg)  
344 lb (155.5 kg)  
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.  
Weight – Net  
System Weight  
1) Maximum input power tested in accordance with IEC 268-5 recommendations, 50 Hz – 20 kHz band limiting, 6 dB signal crest factor.  
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