QSC Audio SC-433 specifications Features, Specifications, Cinema Loudspeaker System

SC-433

Cinema Loudspeaker System

Features

•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

•THX™ approved 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.

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.

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.

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.

Specifications	SC-433
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-4315	MH-1075
Impedance	5.5Ω	8Ω
Sensitivity 1 watt /1 meter,	99.5 dB	Bi-amp	Tri-amp
half space		105 dB	MF 105 dB	HF 107.5 dB
Maximum Input Power1
8 hours of 6 db crest factor	1200 W RMS	250 W RMS2	275 W RMS	80 W RMS
IEC 268 noise spectrum		passive
		mid-high
2 hours of 6 db crest factor	1500 W RMS	350 W RMS
pink noise, 50 Hz – 20 kHz,
AES method
Recommended Amplifier Power	2400 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
	accept up to #10 AWG	accept up to #10 AWG stranded wire
	stranded wire
Transducers	Three 15" (381mm) high efficiency,	10" high efficiency mid range,
	extended bass woofer featuring	1.5" (38mm) exit, 3" titanium
	4" copper voice coils	diaphragm compression driver
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)	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	260 lb (118 kg)	85 lb (39 kg)
System Weight	345 lb (157 kg)
Baffle Cut-Out	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.