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QSC Subwoofer SB-7118

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*TD-000150-00*

Cinema Loudspeaker Systems User Manual

SB-5118 and SB-7118 SINGLE-18” Subwoofers

Introduction

The SB-5118 and SB-7118 are specially designed cinema subwoofers, featuring 500 and 700

watt, respectively, 18” (460mm) 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-1 or SF-3 Subwoofer Filter modules or the QSC Dig-

ital Cinema Monitor 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 fre-

quency range extends to below 25 hertz when used with the correct B6 filter.

The two custom 500 watt (700 watt, SB-7118), 18” transducers were developed especially for

cinema use. The woofers feature 4” (100mm) voice coils and vented pole pieces to ensure cool

operation, even at high power levels. Cooler temperatures increase driver lifespan and

decrease problematic power compression at high drive levels. Undercut pole pieces provides a

Symmetrical Magnetic Gap (SMG), reducing second harmonic distortion.

Enclosures are constructed of high quality MDF panels.

Large, Fully Radiused Ports (FRP) ensure smooth air flow through the ports, especially at higher

drive levels. This prevents potentially audible port turbulence noise. Both internal and external

port openings are fully radiused.

With Symmetrical Port Loading (SPL) bass ports are evenly spaced on each side of the trans-

ducers, making internal pressure more uniform across the back surface of the transducer. 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.

Enclosure is not designed to be suspended, flown, or rigged. Do not suspend,

fly, or rig this enclosure.

This product is capable of producing sound pressure levels that can perma-

nently damage human hearing. Always keep sound pressure levels in the lis-

tening area below levels that can damage human hearing.

Install in accordance with QSC Audio Product’s instructions and a licensed,

professional engineer. Only use attachments, mounts, accessories, or brack-

ets specified by QSC Audio Products, Inc. Refer all servicing to qualified per-

sonnel. Servicing is required when the apparatus has been damaged in any

way.

WARNING! Before placing, installing, rigging, or suspending any speaker

product, inspect all hardware, suspension, cabinets, transducers, brackets

and associated equipment for damage. Any missing, corroded, deformed or

non-load rated component could significantly reduce the strength of the

installation, placement, or array. Any such condition severely reduces the

safety of the installation and should be immediately corrected. Use only

hardware which is rated for the loading conditions of the installation and any

possible short-term unexpected overloading. Never exceed the rating of the

hardware or equipment. Consult a licensed, professional engineer when any

doubt or questions arise regarding a physical equipment installation.

TD-000269-00 rev.A

QSC® is a registered trademark of QSC Audio Products, Inc.

“QSC” and the QSC logo are registered with the U.S. Patent and Trademark Office

1675 MacArthur Blvd., Costa Mesa, CA, 92626 USA

Main Number (714) 754-6175 Sales & Marketing (714) 957-7100 or toll free (USA only) (800) 854-4079

Customer Service(714) 957-7150 or toll free (USA only) (800) 772-2834

Connections

Normal Connection

The SB-5118/7118 has barrier strip screw termi-

nals for connection. The terminals accept up to

#10 AWG (5.3mm2) stranded loudspeaker wiring.

Use the largest wire size and shortest wire

length possible for a given installation. Observe

the polarity markings and keep polarity consis-

tent throughout the system for best performance.

Parallel Connection of Second SB-5118/7118

The terminals marked OUTPUT may be used to

connect another SB-5118/7118 in parallel. Con-

nect the wires as shown in the illustration, at

right.

Normal Connection Example:

Amplifier capable of

driving 4 ohm loads

Amplifier capable of

driving 2 ohm loads

Parallel Connection Example:

Produktspecifikationer

Varumärke:	QSC
Kategori:	Subwoofer
Modell:	SB-7118
Färg på produkten:	Zwart
Vikt:	3200 g
Bredd:	151 mm
Djup:	142 mm
Höjd:	242 mm
Användarmanual:	Ja
Anslutningsteknik:	Bedraad
Genomsnittlig effekt:	100 W
Rekommenderad användning:	Studio
Ljudutgångskanaler:	1.0 kanalen
Högtalarplacering:	Floor, Tabletop/bookshelf
Antal förare:	2
Bashögtalare:	Ja
Frekvensomfång:	55 - 23000 Hz
Känslighet:	100 dB
Typ av högtalare:	2-weg
Förstärkare:	Ingebouwd
Diameter woofer:	4 "
Diameter högtonenhögtalare:	0.75 "
XLR in:	Ja
Tweeter:	Ja
Crossover frekvens:	3000 Hz