QSC SB-5118, SB-7118 Brochure
Features
• SB-5118 features a 500 W, 18" transducer
• SB-7118 features a 700 W, 18" transducer
• Frequency range extends to below 25 Hz when
used with the correct B6 filter
• DCP, and SF-3 signal processors optionally available
• Enclosures feature vandal-resistant woofer
mounting bolts
SB-5118/SB-7118
18" Cinema Subwoofers
Part of the DCS Digital Cinema Speaker Series, QSC’s
SB-5118 and SB-7118 subwoofers offer a unique solution
that addresses the requirements of digital motion picture
soundtracks. Featuring a high excursion, 18" low-frequency
transducer mounted in ported enclosures, these systems
extend response to the lowest audible frequency.
The two custom 18" transducers were developed especially
for cinema use. The woofers feature 4" voice coils and vented
pole pieces to ensure cool operation, even at high power
levels. Cooler temperatures increase driver lifespan and
decrease power compression at high drive levels. Undercut
pole pieces provide a symmetrical magnetic gap, reducing
second harmonic distortion. Enclosures are constructed of
high-quality MDF Panels.
Large, fully radiused ports ensure smooth airflow, especially
at higher drive levels. This prevents potentially audible port
turbulence noise. Both internal and external port openings
are flared. With symmetrical port loading, the bass ports
are evenly spaced on each side of the transducers, making
internal pressure more uniform across the back surface of the
woofer. This prevents the cone from being displaced to one
side or another by unbalanced air pressure, reducing the
chance of driving the voice coil out of the center of the gap
at high drive levels.
The SB-5118 and SB-7118 are specially designed cinema
subwoofers, featuring 500 and 700 watt, respectively, 18"
(460 mm) low-frequency transducers mounted in ported
enclosures. The enclosures are tuned to 25 hertz and
use a B6 alignment. These should be used with the B6
boost filter option provided by the QSC SF-3 Subwoofer
Filter modules or the QSC Digital Cinema Processor to
ensure extended response to the lowest audible frequencies.
Meeting cinema requirements for the extended low-frequency
response differentiates the SB-5118 and SB-7118 from
more conventional “rock-and-roll” subwoofer systems. Their
frequency range extends to below 25 hertz when used with
the correct B6 filter.
Specifications
Frequency Range
-6 dB half space 24 Hz – 100 Hz 22 Hz – 100 Hz
-10 dB half space 19 Hz – 250 Hz 19 Hz – 250 Hz
Maximum Output
Calculated Peak at Rated Power
Calculated Continuous
Impedance 8Ω nominal 8Ω nominal
Maximum Input Power
100 hours of 6 db crest factor
IEC 268 noise spectrum
2 hours of 6 db crest factor
pink noise, 50 Hz – 20 kHz,
AES method
Recommended Amplifier Power
Sensitivity 1 watt /1 meter, half space 96.5 dB 98 dB
Transducer 18" (457 mm) 500 W
Recommended Processing LF boost frequency = 25 Hz, Q = 2.0, Gain = +6 dB provided
Connectors Barrier strip screw terminals accept up to #10 AWG stranded
Enclosure B6 alignment, vented enclosure with summetrical port
Dimensions (HWD) 35.75" x 30" x 20.3"
Weight – Net 160 lb (72.4 kg) 162 lb (73.3 kg)
1) All frequency ranges specified refer to measured free field response (half space, 2π).
2) Calculated SPL at 1m, (half space, 2π), speaker operating at rated RMS power with pink noise within specified
frequency range.
3) Maximum input power tested in accordance with IEC 268-5 recommendations, 50 Hz – 20 kHz band limiting, 6 dB signal
crest factor.
1
2
3
SB-5118 SB-7118
129 dB
123 dB
800 W RMS
1000 W RMS
1600 W RMS maximum
high efficiency subwoofer
transducer featuring a 4"
(100 mm) copper coil on
a Kapton former
by DCP 300, DCM or SF-3
wire, four terminals; two inputs and two parrallel outputs
design, tuned to 25 Hz, constructed of MDF and heavily
braced. Features vandal resistant woofer mounting bolts
908 mm x 762 mm x 516 mm
132 dB
125 dB
1200 W RMS
1500 W RMS
2600 W RMS maximum
18" (457 mm) 700 W
high efficiency subwoofer
transducer featuring a 4"
(100 mm) copper coil on
a glass fiber former
SB-5118/SB-7118
Dimensions
35.75"
908 mm
30"
762 mm
SideFront
4"
101.6 mm
20.3"
516 mm
9.75"
247.65 mm
Specifications subject to change without notice.
©2009 QSC Audio Products, LLC. All rights reserved. QSC and the QSC logo are registered trademarks of QSC Audio Products, LLC in the U.S. Patent and Trademark offi ce and other
countries. All other trademarks are the property of their respective owners. Patents may apply or be pending.
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