QSC Audio SC-323H User Manual

Features
• 3-wayselectable,biortri-amplifiedscreenchannelsystem
• MH-1075providesincreasedhigh-frequencyoutput
• LF-3215isconstructedofMDFandisheavilybraced
• Low-distortionwaveguidesprovidehighlyarticulatedialogue
• Shallowdepth(20")facilitatesinstallation
SC-323H
Cinema Loudspeaker System
Developed specifically for the unique requirements of professional motion picture playback, the SC-323H extends QSC’s commitment to the cinema market. As a member of the DCS Digital Cinema Speaker Series, the SC-323H is a 3-way, selectable bi or tri-amplified screen channel loudspeaker system comprised of two main units—the MH-1075 mid-high frequency system and the LF-3215 low-frequency system.
The MH-1075 mid-high system features a high output, horn loaded 10" midrange cone driver and a 3" (75 mm) 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-3215 dual 15" (381 mm) 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 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.
The SC-323H 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-3215 enclosure.
Specifications SC-323H
Nominal Coverage 90° horizontal x +20 to -30° vertical
Frequency Range 32 Hz – 16 kHz (-6 dB)
Crossover Frequency 250 and 1700 Hz, 24 dB per octave
LF-3215 MH-1075
Impedance 4Ω 8Ω
Sensitivity 1 watt /1 meter, 98.5 dB Bi-amp Tri-amp half space 105 dB MF 105 dB HF 107.5 dB
Maximum Input Power
8 hours of 6 db crest factor 600 W RMS 250 W RMS2 275 W RMS 80 W RMS IEC 268 noise spectrum
2 hours of 6 db crest factor 800 W RMS 350 W RMS pink noise, 50 Hz – 20 kHz, AES method
Recommended Amplifier Power 1200 W RMS maximum 800 W RMS maximum
Recommended Processing Subsonic filter below 30 Hz, 4th order LR crossover at 200 and 1700 > 18 dB per octave Hz via QSC DCM or QSControl.net™
Connectors Barrier strip screw terminals Barrier strip screw terminals
Transducers Two 15" (381mm) high efficiency, 10" high efficiency mid range,
Enclosure Quasi B4 alignment, ported Tilt/Pan Bracket
Dimensions (HWD) 36" x 30" x 20.3" 39" x 30" x 20" (910 mm x 762 mm x 516 mm) (990 mm x 762 mm x 508 mm)
Weight – Net 172 lb (78 kg) 85 lb (39 kg)
System Weight 257 lb (117 kg)
Baffle Cut-Out 76" 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.
1
passive mid-high
accept up to #10 AWG accept up to #10 AWG stranded wire stranded wire
extended bass woofer featuring 1.5" (38mm) exit, 3" titanium 3" copper voice coils diaphragm compression driver
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
SC-323H
Top
21.7"
551 mm
30"
762 mm
Dimensions
20.3"
515 mm
Front
Side
39"
990 mm
75"
1900 mm
4"
102 mm
36"
910 mm
18.9"
480 mm
Specifications subject to change without notice.
QSC, the QSC logo and QsControl.net are registered trademarks of QSC Audio Products, LLC in the U.S. Patent and Trademark office and other countries. All other trademarks are the property of their respective owners. Patents may apply or be pending.
1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: 714/754-6174
SC-323H Spec Sheet – 0 6/20/08
qscaudio.com
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