QSC Audio Speaker WL218 sw User Guide

WL218-sw  
WideLine™ Subwoofer  
Features  
• Simple, convenient suspension system based on the  
proven QSC WideLine design. Supports up to 8 WL218-sw  
subwoofers with 10:1 design factor  
• Very high acoustic output capability – 139 dB SPL  
(1m) peak  
• Ample “punch” combined with low-frequency extension  
down to 31 Hz  
• Comprehensive transport and handling features  
including an easy to attach dolly and twelve thoughtfully  
placed handles  
• Premium-grade, long-excursion, high-power woofers with  
4", fiberglass voice coils, double layer spiders and triple  
roll surrounds  
• Birch ply enclosure with independent, dual chambers  
and extensive internal bracing for rigidity and solid,  
accurate reproduction  
The WL218-sw is a premium, high-performance,  
dual 18" subwoofer designed for suspended or  
ground stacked use in the most demanding  
touring or installed concert applications.  
With an impressive combination of punch,  
low-frequency extension and accuracy, the  
WL218-sw is an ideal companion for QSC’s  
acclaimed WideLine as well as other professional  
sound reinforcement systems.  
the subwoofers may be stacked using the  
contributions to cabinet rigidity come from vent  
walls constructed of the same plywood as the  
enclosure. Each woofer is protected by a heavy-  
duty, 14 gauge, powder coated steel grille and  
housed in its own, separate chamber to prevent  
failure of one driver from causing damage to  
the other.  
interlocking feet and recess features machined  
into the enclosure’s end caps.  
The 18" woofers incorporate a double layer  
spider and triple roll surround for extended  
and controlled excursion at extreme power.  
The 4" voice coil is wound on a fiberglass  
former to prevent deformation at high operating  
temperatures and is extensively vented to reduce  
powercompression.Analuminumdemodulating  
ring is employed for low distortion.  
Despite the extremely large amount of air  
moving in the ports, careful attention to detail  
has resulted in a system that is free of port  
distortion “chuffing. Ample port area allows  
massive amounts of air to move freely with  
minimal turbulence and the ports are arranged  
so as to eliminate asymmetrical loading of the  
woofers, which can result in distortion and  
voice coil failure related to rocking-modes.  
Sound system designers and operators are  
increasingly turning to subwoofer systems that  
are flown with the main array for a more  
seamless acoustical transition from the bass to  
the low-mid region. With a simple, three-point  
suspension design that is essentially a scaled  
up version of the QSC WideLine system, the  
WL218-sw fulfills the requirement while also  
delivering powerful and stunningly accurate low  
frequency output.  
Theextremelymusicalyetpowerfulperformance  
of the subwoofer is the result of carefully  
balancing the transducer selection, cabinet  
volume and port tuning. The resulting system  
offers plenty of “punch” while maintaining  
ample extension so the musically important  
and satisfying fundamentals are solidly and  
accurately reproduced.  
Transport and handling were also given high  
priority. No matter how the box is deployed  
one of the dozen handles will be where it  
needs to be. The included dolly has rugged,  
3.5", ball bearing casters and an elegantly easy-  
to-use, snap on mechanism for attachment to  
the enclosure.  
Suspension of the array requires one AF218-sw  
for each subwoofer array. The AF218-sw is a  
simple, heavy-duty array frame constructed  
of welded, aviation-grade 6061-T6 aluminum  
and intended for suspension of up to eight  
WL218-sw subwoofers with a 10:1 design  
factor. For ground-supported applications,  
The enclosure of the WL218-sw is constructed  
of premium quality birch plywood finished  
in an environmentally friendly, waterborne,  
polymer finish that stands up to life on the  
road while also being field repairable. Extensive  
internal bracing is employed to eliminate  
acoustic losses due to panel resonance. Further  
QSControl.net/BASIS™ DSP files are available for  
download. They are tuned for use with WL218-sw  
to provide optimized performance.  
 

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