Qsc-audio SC-434 User Manual download pdf

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 4-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 high-

frequency 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 high-frequency 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.

SC-434

Cinema Loudspeaker System

Features

• 4-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featuressinglewooferchambers

• Low-distortionwaveguidesprovidehighlyarticulatedialogue

• Shallowdepth(20")facilitatesinstallation

• THX™approvedforprofessionalcinemaapplications

NEW!

Specifications

SC-434

Nominal Coverage 90° horizontal x +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 5.5Ω MF: 8Ω HF: 8Ω VHF: 8Ω

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

8 hours of 6 db crest factor

IEC 268 noise spectrum

1200 W 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 W RMS MF: 800 W RMS

HF/VHF: 500 W RMS maximum

Recommended

Amplifier Power

2400 W 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

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 (HWD) 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)

Weight – Net 260 lb (118 kg) 84 lb (38.5 kg)

System Weight 344 lb (155.5 kg)

1) Maximum input power tested in accordance with IEC 268-5 recommendations, 50 Hz – 20 kHz band limiting, 6 dB signal crest factor.

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Summary of Contents

Page 1 - Cinema Loudspeaker System

Developed specifically for the unique requirements of professional motion picture playback, the SC-434 extends QSC’s commitment to the c

Page 2 - Dimensions

SC-434Dimensionsqscaudio.comSpecifications subject to change without notice.1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/

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Qsc-audio SC-434 User Manual

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