QSC SB-7118, SB-5118 Owner's Manual

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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 Digital Cinema Monitor to ensure extended response to the lowest audible frequencies.

Meeting cinema requirements for the extended low frequency response differentiates the SB5118 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.

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 transducers, 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 permanently damage human hearing. Always keep sound pressure levels in the listening 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 brackets specified by QSC Audio Products, Inc. Refer all servicing to qualified personnel. 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-000150-00*

TD-000269-00 rev.A © Copyright 2007, QSC Audio Products, Inc.

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

QSC SB-7118, SB-5118 Owner's Manual

Connections

Normal Connection

The SB-5118/7118 has barrier strip screw terminals 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 consistent 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. Connect the wires as shown in the illustration, at right.

Normal Connection Example:

Parallel Connection Example:

Amplifier capable of driving 4 ohm loads

Amplifier capable of driving 2 ohm loads

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