QSC KS118 | 18in, 3600W, 136 dB | Powered Subwoofe...
$2,499.99
The QSC KS118 is a high-output 18-inch powered subwoofer designed to deliver powerful, deep bass for mobile DJs, live performances, clubs, and professional AV production. Featuring a 3600W peak Class-D amplifier, an 18-inch long-excursion driver, and up to 136 dB maximum SPL, it provides exceptional low-frequency performance for demanding sound reinforcement applications. Advanced onboard DSP, selectable DEEP mode, and cardioid array capabilities offer flexible bass control, while its rugged birch plywood enclosure and four heavy-duty casters make transportation and deployment convenient.
The QSC KS118 is engineered for audio professionals who need substantial low-frequency output without sacrificing clarity or control. Its 18-inch direct-radiating, long-excursion woofer is powered by a 3600W peak Class-D amplifier, delivering a maximum rated SPL of 136 dB at 1 meter. With a frequency response of 41 Hz to 98 Hz (-6 dB) and a frequency range extending down to 35 Hz (-10 dB), the KS118 provides deep, dynamic bass for live music, mobile entertainment, dance clubs, and large-scale event production.
Advanced onboard digital signal processing optimizes performance while providing flexible control over the subwoofer's output. Selectable DEEP mode enhances low-frequency extension, while adjustable crossover and delay settings allow integration with full-range loudspeakers. Users can also save and recall scenes for commonly used configurations, simplifying setup across different venues and applications.
For applications requiring greater control over bass dispersion, the KS118 supports cardioid array operation when two or more units are arranged and configured appropriately. This directional mode helps reduce unwanted low-frequency energy behind the array while maintaining powerful bass output toward the audience. A single KS118 operates in omnidirectional mode, making it suitable for conventional subwoofer deployment.
The rugged enclosure is constructed from 15 mm birch plywood and finished in black with a protective 16-gauge powder-coated steel grille. Integrated carrying handles and four low-noise, heavy-duty casters simplify transportation, while rubber feet support vertical and horizontal positioning. An M20 threaded pole receptacle accommodates compatible 35 mm loudspeaker poles for stacking full-range speakers above the subwoofer. Combining powerful amplification, flexible DSP control, and durable construction, the KS118 is an effective low-frequency solution for DJs, touring musicians, rental companies, and permanent sound installations.
| Brand | QSC |
| Name | QSC KS118 |
| Primary Category | Powered Subwoofer |
| Build Material | 15 mm birch plywood |
| Dimensions | 25.2 x 20.5 x 30.9 in inch |
| Included Accessories | 4 low-noise heavy-duty casters |
| Mounting Options | Vertical or Horizontal with M20 threaded pole receptacle |
| Weight | 104 lb lb |
| Connectivity Protocols | 2 locking XLR/1/4-inch combo inputs, 2 XLR loop-through outputs |
| Frequency Response | 41 Hz - 98 Hz Hz |
| IP Rating | CE, WEEE, UL, China RoHS, RoHS II, FCC Class B |
| Max SPL | 136 dB dB |
| Wattage | 3600W peak W |
| Control Interfaces | Power On/Off, Gain, Rotary Encoder, 2 Selection Buttons |
| Onboard DSP | Advanced DSP with DEEP mode, adjustable crossover, delay, cardioid mode, save/recall scenes |
| Warranty Length | 6 years with qualifying product registration years |
| Woofer Size | 18 inch inch |
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The RCF SUB 18AX feels like a serious single-18” powered subwoofer for users who want strong low-end output without giving up control over system tuning. The 18” driver with a 4” voice coil gives it the kind of punch and depth I’d look for in mobile DJ systems, live sound rigs, and event production setups where the sub has to work hard but still stay clean. One of the better features here is RCF’s Bass Motion Control, which helps the SUB 18AX maintain tighter cone control at higher output levels. That matters in real use, especially when you’re pushing dance music, kick drum, or bass-heavy playback and want the low end to stay defined instead of getting loose or muddy. The onboard color touch panel is also a practical upgrade. Being able to adjust settings directly from the sub makes setup faster, and the liveRemote app adds another layer of convenience by giving wireless control over EQ, delay, and crossover settings. That is especially useful when the sub is placed under a stage, behind a booth, or anywhere that is not easy to reach during setup. I also like that the SUB 18AX includes crossover presets for pairing with different RCF speakers. For users building an RCF-based system, that makes it easier to get a clean handoff between tops and subs without spending extra time guessing at crossover points. For DJs, bands, production companies, and AV users who want a powerful, modern 18” powered sub with flexible tuning, the RCF SUB 18AX is a strong option.
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