QSC Audio SC-322 - Manual

Developed specifically for the unique requirements
of professional motion picture playback, the SC-322
extends QSC’s commitment to the cinema market. As
a member of the DCS Digital Cinema Speaker Series,
the SC-322 is a two-way, bi-amplified screen channel
loudspeaker system comprised of two main units—the
HF-63 high-frequency system and the LF-3215 low-
frequency system.
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. The LF-3215 dual 15" (381mm) low-
frequency enclosure is designed specifically to address
the extended low-frequency response required for
cinema applications.
The LF-3215 covers the frequency range from 35 Hz to
1000 Hz, depending upon the high-frequency system
requirements. 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-322 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-3215 enclosure.
SC-322
Cinema Loudspeaker System
Specifications SC-322
Nominal Coverage 90° horizontal x +20 to -30° vertical
Frequency Range 32 Hz - 16 kHz (-6 dB)
Crossover Frequency 1000 Hz, 24 dB per octave
LF-3215 HF-63
Impedance 4Ω 8Ω
Sensitivity 1 watt /1 meter, 98.5 dB 107.5 dB
half space
Maximum Input Power 1
8 hours of 6 db crest factor 600 W RMS 40 W RMS
IEC 268 noise spectrum
2 hours of 6 db crest factor 800 W RMS 60 W RMS
pink noise, 50 Hz - 20 kHz,
AES method
Recommended Amplifier Power 1200 W RMS maximum 100 W RMS maximum
Recommended Processing Subsonic filter below 30 Hz, 4th order LR crossover at 1000 Hz
> 18 dB per octave
Connectors Barrier strip screw terminals Barrier strip screw terminals
accept up to #10 AWG stranded accept up to #10 AWG stranded
wire, four terminals; two inputs wire, four terminals; two inputs
and two parallel outputs and two parallel outputs
Transducers Two 15" (381mm) high efficiency, 1.5" (38mm) exit, 2.5" titanium
extended bass woofer featuring diaphragm compression driver
3" copper voice coils
Enclosure Quasi B4 alignment, ported Tilt/Pan Bracket
enclosure with fully flared ports, ±10° vertical tilt
symmetrical port design, tuned to ±10° horizontal pan
36 Hz, constructed of MDF and
heavily braced. Features vandal
resistant woofer mounting bolts
Dimensions (HWD) 36" x 30" x 20.3" 16" x 30" x 20"
(910 mm x 762 mm x 516 mm) (406 mm x 762 mm x 508 mm)
Weight - Net 172 lbs (78 kg) 40 lbs (18.4 kg)
System Weight 212 lbs (96.4 kg)
Baffle Cut-Out 53" 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.
Features
• Two-way, bi-amplified screen channel system
• HF-63 provides 90° horizontal by +20° to -30° vertical coverage
• LF-3215 is constructed of MDF and features single woofer chambers
• Low-distortion waveguide provides highly articulate dialogue
• Shallow depth (20") facilitates installation