Cinema Loudspeaker System

SC-433

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
8 hours of 6 db crest factor	1200 W RMS	250 W RMS2	275 W RMS	80 W RMS
IEC 268 noise spectrum		passive
IEC 268 noise spectrum		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.

SC-433 specifications

The QSC Audio SC-433 is a powerful two-way loudspeaker specifically designed for professional audio applications, offering exceptional sound quality and performance. It is an ideal choice for a variety of settings, including concert venues, theaters, and corporate events, where high-definition audio is paramount.

One of the standout features of the SC-433 is its high-output capability. It incorporates a dual 12-inch low-frequency driver, providing robust bass response and the ability to generate high Sound Pressure Levels (SPL). Coupled with a 1.4-inch compression driver, the SC-433 reproduces clear and articulate high frequencies, ensuring that the full audio spectrum is delivered with precision.

The speaker employs advanced horn loading technology, which enhances the efficiency and directivity of the sound. This feature allows for better control of the coverage area, making it easier to achieve optimal acoustic performance in various environments. The waveguide design utilized in the SC-433 is meticulously engineered to provide a coherent and consistent sound field, resulting in less distortion and smoother frequency response.

Durability and rugged build quality are also key characteristics of the SC-433. The cabinet is constructed from high-quality plywood and finished with a durable coating, designed to withstand the rigors of touring and long-term installation use. Its design includes integrated rigging points and handles for ease of transportation and setup.

For added versatility, the SC-433 is equipped with QSC’s DMT (Directivity Matched Transition) technology. This innovation ensures a seamless transition between the low and high-frequency drivers, enhancing the overall sound quality and coherence of the audio output. Additionally, the speaker includes high-performance crossover components, ensuring that each driver operates within its optimal frequency range.

Another notable aspect of the SC-433 is its compatibility with the QSC Networked Audio System, which allows for seamless integration with other QSC products. This feature is particularly useful for larger setups, enabling sound engineers to manage multiple speakers and achieve a cohesive audio experience.

In summary, the QSC Audio SC-433 is a dedicated professional audio solution, characterized by its high output capacity, advanced sound technology, and robust construction. It is a versatile option suitable for various applications, providing reliable performance and exceptional sound fidelity in both live and installed sound environments.

SC-433