
GP Series
GP218-sw
High Output, Direct Radiating, 
Vented Subwoofer
GP218-sw
Features
• Dual premium-grade, long 
excursion, high power 18-inch 
transducers with 4-inch 
voicecoil, dual layer spider 
and triple-roll surrounds 
• Interlocking feet and recess 
features allow for allow for 
rigid vertical stacking 
• Built-in handles along with 
the optional dolly board 
and soft cover offers ease of 
transport 
• M10 fittings allows for 
suspension in permanent and 
portable applications 
• Dual NL4 Speakon connectors 
• 18mm Baltic birch plywood 
construction
• 16-Gauge powder coated 
Steel Grilles 
• Available in black and white 
• Complete EASE, CAD & BIM 
information available online
Performance Spaces ∙ Worship Facilities ∙ Portable and Live Sound 
∙ Dance Clubs ∙ Indoor Sports Facilities ∙ Themed Entertainment
The GP218-sw is a premium, highperformance, direct radiating dual 18-inch 
subwoofer designed for use in portable 
and installed sound applications. This 
powerful subwoofer offers plenty of 
“punch” while maintaining ample extension 
so the musically important fundamentals 
are solidly and accurately reproduced. 
With an impressive combination of 
low-frequency extension and musical 
accuracy, the GP218-sw is an ideal 
companion to QSC’s WideLine Series, ILA 
Series, AcousticPerformance™ Series and 
AcousticDesign™ Series loudspeakers.
The GP218-sw features two 18-inch 
transducers that incorporate a double layer 
spider and triple roll surround for extended 
and controlled excursion at extreme power. 
The 4-inch voicecoil is wound on a fiberglass 
former to prevent deformation at high 
operating temperatures and is extensively 
vented to reduce power compression. An 
aluminum demodulating ring is employed to 
further reduce distortion.
The GP218-sw is housed in an 18mm 
Baltic birch plywood enclosure and finished 
in an environmentally friendly, waterborne, 
polymer finish rugged enough for the 
demands of everyday use while also 
being field repairable. Internal bracing is 
employed to eliminate acoustic losses due 
to panel resonance while maintaining the 
enclosure’s robustness. 
Further contributions to cabinet rigidity 
include vent walls constructed of the same 
plywood as the enclosure. Ample port area 
allows free movement of air resulting in 
minimal turbulence and port distortion. 
Finishing the enclosure’s aesthetic design, 
the transducer is protected by a 16-gauge, 
powder coated steel grille.
To aid in transporting the GP218-sw, the 
unit features built-in handles with options 
for a dolly board and soft cover. For 
increased versatility, the GP218-sw can be 
stacked vertically using their interlocking 
feet and recess features machined into the 
enclosure’s top panel. 
 

GP218-sw Details
Front
Top
Side
Specifications:
System Details
Frequency Range (-10dB) 24Hz – 1.2kHz
Power Capacity
Nominal Sensitivity
Maximum Rated SPL 135dB @1m, continuous3          
Nominal Impedance 4Ω
Transducer 457mm (18-inch) driver with 102mm (4-inch) 
Recommended Power 3000 - 4000W
Enclosure Details
Input Connector Dual NL4 connector
Pin Outs 1+/1-  Sub
Enclosure Material 18mm Baltic birch plywood
Attachment Points  16x threaded M10 inserts
Grille 16 Gauge powder coated steel
Dimensions (HxWxD) 508 mm x 1198 mm x 762 mm                    
Net Weight 87 kg (191 lb)
Shipping Weight 95 kg (209 lb)
Optional Accessories CP218-0 transportation dolly
1
1700W (82.5V) continuous 
3400W peak
2
102dB, 1W@1m
141dB @1m, peak
4
Voicecoil
2+/2-  N/C
(20" x 47.2" x 30")
CP218-1 transportation dolly plus soft cover
As part of QSC’s ongoing commitment to product development, specifications are 
subject to change without notice.
1
 2 hour rating using IEC60268 noise based on minimum impedance
2
 Mid-band based on nominal impedance
3
 Calculated as the nominal sensitivity plus 10x the log of continuous 
 rated power in volts squared divided by nominal impedance
4
 Calculated as the continuous calculated max output plus 6dB
1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: 714/754-6174  please recycle
© 2012 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 office and other 
countries. DMT is a trademark of QSC. Speakon is a registered trademark of Neutrik
GP218-sw Spec Sheet 12/3/2012