QSC SC-412 User Manual

Features
• Two-way, bi-amplified screen channel system
• SC-412 provides 90° horizontal by +20° to -30° vertical coverage
• Low-distortion waveguides provide highly articulate dialogue
• Shallow depth (20") facilitates installation
Developed specifically for the unique requirements
of professional motion picture playback, the SC-412
extends QSC's commitment to the cinema market. As
a member of the DCS Digital Cinema Speaker Series,
the SC-412 is a two-way, bi-amplified screen channel
loudspeaker system comprised of two main units—the
HF-75 high-frequency system and the LF-4115 low-
frequency system.
The HF-75 high-frequency system features a 3" large
format (75mm) titanium diaphragm compression
driver mounted on a custom designed high-frequency
cinema horn with an adjustable pan and tilt bracket.
The HF-75 includes a driver protection and equalization
network. DC blocking capacitors protect against DC or
low-frequency signals that would likely destroy an
unprotected driver. Power limiter circuitry protects the
driver from overpowering and a response correction
filter smoothes the frequency response of the horn/
driver combination. The driver and equalization
network provides for more reliable operation, ensuring
the show will go on.
The LF-4115 15" (381mm) 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 1000 Hz, depending upon the high-
frequency system requirements.
The SC-412 is designed for ease of installation.
The HF-75 components come pre-assembled to
reduce field assembly time. Three bolts are all that
are required to secure the HF-75 to the top of the
LF-4115 enclosure.
Specifications
Nominal Coverage 90° horizontal x +20 to -30° vertical
Frequency Range 33 Hz - 16 kHz (-6 dB)
Crossover Frequency 700 Hz, 24 dB per octave
LF-4115
Impedance 4Ω
Sensitivity 1 watt /1 meter, 93.5 dB
half space
1
Maximum Input Power
8 hours of 6 db crest factor 400 W RMS
IEC 268 noise spectrum
2 hours of 6 db crest factor 500 W RMS
pink noise, 50 Hz - 20 kHz,
AES method
Recommended Amplifier Power 800 W RMS maximum
Recommended Processing Subsonic filter below 30 Hz,
> 18 dB per octave
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
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
Dimensions (HWD) 18.5" x 30" x 20.3"
(470 mm x 762 mm x 516 mm)
Weight - Net 83 lbs (38 kg)
System Weight
Baffle Cut-Out
1) Maximum input power tested in accordance with IEC 268-5 recommendations, 50 Hz - 20 kHz band limiting, 6 dB signal crest factor.
SC-412
Cinema Loudspeaker System
SC-412
HF-75
8Ω
107.5 dB
60 W RMS
80 W RMS
100 W RMS maximum
4th order LR crossover at 700 Hz
Barrier strip screw terminals
accept up to #10 AWG
stranded wire
1.5" (38mm) exit, 3" titanium
diaphragm compression driver
Tilt/Pan Bracket
±10° vertical tilt
±10° horizontal pan
16" x 30" x 20"
(406 mm x 762 mm x 508 mm)
40 lbs (18.4 kg)
123 lbs (56.4 kg)
35.5" x 32"