QSC Audio Speaker System SC 312 User Guide

SC-312  
Cinema Loudspeaker System  
Features  
• 2-way, bi-amplified screen channel system  
• SC-312 provides 90° horizontal by +20° to -30° vertical coverage  
• Low distortion waveguide provides highly articulate dialogue  
• Shallow depth (20") facilitates installation  
Developed specifically for the unique requirements  
of professional motion picture playback, the SC-312  
extends QSC’s commitment to the cinema market. As  
a member of the DCS Digital Cinema Speaker Series,  
the SC-312 is a 2-way, bi-amplified screen channel  
loudspeaker system comprised of two main units—the  
HF-63 high-frequency system and the LF-3115 low-  
frequency system.  
Specifications  
Nominal Coverage  
Frequency Range  
SC-312  
90° horizontal x +20 to -30° vertical  
33 Hz – 16 kHz (-6 dB)  
1000 Hz, 24 dB per octave  
LF-3115  
Crossover Frequency  
HF-63  
8Ω  
Impedance  
8Ω  
Sensitivity 1 watt/1 meter,  
half space  
95.5 dB  
107.5 dB  
The HF-63 high-frequency system features a 2.5"  
(63mm) titanium diaphragm compression driver  
mounted on a custom designed high frequency  
cinema horn with an adjustable pan and tilt bracket.  
The HF-63 includes a driver protection and equalization  
network. DC blocking capacitors protect against DC or  
low-frequency signals that would likely destroy an  
unprotected driver. Power limiter circuitry protects the  
driver from overpowering and a response correction  
filter smoothes the frequency response of the horn/  
driver combination. The driver and equalization  
network provides for more reliable operation, ensuring  
the show will go on.  
Maximum Input Power1  
8 hours of 6 db crest factor  
IEC 268 noise spectrum  
300 W RMS  
400 W RMS  
40 W RMS  
60 W RMS  
2 hours of 6 db crest factor  
pinknoise, 50 Hz – 20 kHz,  
AES method  
Recommended Amplifier Power 600 W RMS maximum  
100 W RMS maximum  
Recommended Processing  
Subsonic filter below 30 Hz,  
> 18 dB per octave  
4th order LR crossover at 1000 Hz  
Connectors  
Barrier strip screw terminals  
accept up to #10 AWG  
stranded wire  
Barrier strip screw terminals  
accept up to #10 AWG  
stranded wire  
Transducers  
Enclosure  
One 15" (381mm) high efficiency,  
extended bass woofer featuring a  
3" copper voice coil  
1.5" (38mm) exit, 2.5" titanium  
diaphragm compression driver  
The LF-3115 15" (381mm) low-frequency enclosure  
is designed specifically to address the extended low-  
frequency response required for cinema applications.  
The LF-3115 covers the frequency range from  
35 Hz to 1000 Hz, depending upon the high-  
frequency system requirements.  
Quasi B4 alignment, ported  
Tilt/Pan Bracket  
10° vertical tilt  
10° horizontal pan  
enclosure with fully flared ports,  
symmetrical port design, tuned to  
36 Hz, constructed of MDF and  
heavily braced. Features vandal  
resistant woofer mounting bolts  
Dimensions (HWD)  
18.5" x 30" x 20.3"  
16" x 30" x 20"  
(470 mm x 762 mm x 516 mm)  
(406 mm x 762 mm x 508 mm)  
The SC-312 is designed for ease of installation.  
The HF-63 components come pre-assembled to  
reduce field assembly time. Three bolts are all that  
are required to secure the HF-63 to the top of the  
LF-3115 enclosure.  
Weight – Net  
System Weight  
Baffle Cut-Out  
83 lb (38 kg)  
123 lb (56.4 kg)  
35.5" x 32"  
40 lb (18.4 kg)  
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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