QSC SC-414 - Manual

Developed specifically for the unique requirements
of professional motion picture playback, the SC-414
extends QSC’s commitment to the cinema market.
As a member of the DCS Digital Cinema Speaker
Series, the SC-414 is a four-way, selectable tri or
quad-amplified screen channel loudspeaker system
comprised of two main units — the MHV-1090 mid-
high-very high-frequency system and the LF-4115
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
7,000 to 22,000 Hz and eliminates the dome break
up of conventional drivers that can cause resonance
and harsh, metallic sound.
The LF-4115 single 15" (381 mm) low-frequency
enclosure is designed specifically to address the
extended low-frequency response required for cinema
applications. The LF-4115 covers the frequency range
from 35 Hz to 250 Hz.
The SC-414 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-4115 enclosure.

SC-414

Cinema Loudspeaker System

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-4115 is constructed of MDF and is heavily braced

• Low-distortion waveguides provide highly articulate dialogue

• Shallow depth (20") facilitates installation

• THX™ approved for professional cinema applications

Specifications

SC-414

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-4115

MH-1090

Impedance

4

Ω

MF: 8

Ω

HF: 8

Ω

VHF: 8

Ω

Sensitivity 1 watt /1 meter,
half space

93.5 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

400 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

500 W RMS

MF: 800 W RMS
HF/VHF: 500 W RMS maximum

Recommended
Amplifier Power

800 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

One 15" (381mm) high
efficiency, extended bass
woofer featuring a 4" copper
voice coil

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)

18.5" x 30" x 20.3"
(470 mm x 762 mm x 516 mm)

39" x 30" x 20"
(990 mm x 762 mm x 508 mm)

Weight - Net

83 lbs (38 kg)

84 lbs (38.5 kg)

System Weight

167 lbs (76.5 kg)

Baffle Cut-Out

58.75" 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.

NEW!

THX is a trademark of THX Ltd.