DCS Series

Digital Cinema Speakers

SC-434 Cinema 4-way Screen Channel System 

Developed specifically for the unique requirements of professional motion picture playback, the SC-434 extends QSC's commitment to the cinema market. As a member of the DCS Digital Cinema Speaker Series, the SC-434 is a four-way, selectable tri or quad-amplified screen channel loudspeaker system comprised of two main units–the MHV-1090 high-frequency system and the LF-4315 low-frequency system.

The MHV-1090 mid-high-very high system features a high output, horn loaded 10" midrange cone driver and a coaxial neodymium high-frequency/very high-frequency compression driver. The MHV-1090 includes a driver protection network and a passive crossover for tri-amp operation. The protection circuitry prevents low-frequency signals from damaging the high-frequency and very high-frequency driver. 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 coaxial neodymium high-frequency/very highfrequency compression driver provides a dramatic improvement in dynamic response, clarity and transparency. The annular high-frequency diaphragm covers the frequency range between 1800 and 7000 Hz with a smooth, linear response. The large diaphragm excursion of +/-0.8 mm results in high output and increased power handling. The very highfrequency driver covers the frequency range from 7000 to 22,000 Hz and eliminates the dome break up of conventional drivers that can cause resonance and harsh, metallic sound.

The LF-4315 triple 15" (381 mm) 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-434 is designed for ease of installation. The MHV-1090 components come pre-assembled to reduce field assembly time. Three bolts are all that are required to secure the MHV-1090 to the top of the LF-4315 enclosure.

FEATURES

• Four-way selectable, tri or quad- amplified screen channel system
• Unique HF/VHF diaphragm has less mass than traditional diaphragms resulting in exceptional dynamic range, extended high frequency response and lower distortion
• LF-4315 is constructed of MDF and is heavily braced
• Low-distortion waveguides provide highly articulate dialogue
• Shallow depth (20") facilitates installation
• THX Approved

SPECIFICATIONS	SC-434
Nominal Coverage	90° horizontal by +20 to -30° vertical
Frequency Range (-6 dB)	33 - 20 kHz
Active Crossover Frequencies	250, 1700 and 6000 Hz, 24 dB per octave
	LF-4315	MHV-1090
Impedance	5.5 ohms	MF: 8 ohms HF: 8 ohms VHF: 8 ohms
Sensitivity 1 watt/1 meter, half space	99.5 dB	Tri-amp MF:105 dB HF/VHF: 110 dB Quad-amp MF: 105 dB HF: 110 dB VHF: 110 dB
Maximum Input Power 1
8 hours of 6 db crest factor   IEC 268 noise spectrum	1200 watts RMS	MF: 275 W RMS HF/VHF: 230 W RMS MF: 275 W RMS HF: 150 W RMS VHF: 80 W RMS
2 hours of 6 db crest factor pink       noise, 50 Hz - 20 kHz, AES method	1500 watts RMS	MF: 800 W RMS HF/VHF: 500 W RMS maximum
Recommended Amplifier Power	2400 watts RMS maximum	MF: 800 W RMS HF: 500 W RMS VHF: 300 W RMS maximum
Recommended Processing	Subsonic filter below 30 Hz, >18 dB per octave	4th order LR crossover at 250, 1700 and 6000 Hz via QSC DCM or QSControl.net
Connectors	Barrier strip screw terminals accept up to #10 AWG stranded wire	Barrier strip screw terminals accept up to #10 AWG stranded wire
Transducers	Three 15" (381mm) high efficiency, extended bass woofer featuring a 4" copper voice coils	MF: 10" high-effeciency, horn-loaded cone with pahse plug HF/VHF: coaxial neodymium compression driver with 3.5" (90 mm) HF diaphram and 1.75" (44 mm) VHF diaphram
Enclosure	Quasi B4 alignment, ported enclosure with fully flared ports, symmetrical port design, tuned to 36 Hz, constructed of MDF and heavily braced. Features vandal resistant woofer mounting bolts	Tilt/Pan Bracket ± 10° vertical tilt ± 10° horizontal pan
Dimensions (HxWxD)	53" x 30" x 20.3" (1344 mm x 762 mm x 516 mm)	39" x 30" x 20" 990 mm x 762 mm x 508 mm)
Net Weight	260 lbs (118 kg)	84 lbs (38.5 kg)
System Weight	344 lbs (155.5 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.

Specifications subject to change without notice.