QSC KS118 3,600W 18" Powered Subwoofer

The QSC KS118 18 active subwoofer delivers uncompromising low-end power and precision for live sound environments. Powered by a 3,600W Class-D amplifier, this subwoofer is equipped with an 18" direct-radiating woofer that produces deep, chest-pounding bass down to 35Hz. Designed to handle high power and long excursion, the KS118 maintains tight, controlled performance even at high SPLs. Onboard DSP ensures advanced optimization and protection, while the DEEP mode takes low-frequency response to new depths. Whether you're enhancing a full-range speaker system or building a cardioid array, the KS118's robust engineering and innovative features make it a cornerstone for demanding live sound applications.

QSC Active Sub With Powerful 18" Driver for Deep Bass

At the heart of the KS118 is its 18" direct-radiating woofer, engineered for impactful low-end reproduction. This driver handles the high power and long excursion needed to produce bass frequencies as low as 35Hz, ensuring tight and controlled output without distortion. Paired with a 3,600W Class-D amplifier, the KS118 delivers consistent performance even in large venues. Whether used for music or speech reinforcement, the subwoofer's design ensures clear and authoritative low end, making it a reliable solution for live sound professionals seeking precision and power.

Advanced DSP for System Optimization

The KS118's onboard DSP provides advanced tools for optimizing system performance and protection. Users can configure two units in a cardioid setup to focus low-end projection toward the audience while minimizing unwanted energy behind the system. The DSP also monitors temperature, excursion, and voltage levels, ensuring the subwoofer remains protected under demanding conditions. These capabilities allow the KS118 to deliver precise bass response and reliable performance, even during extended operation in challenging live sound environments. This intelligent design ensures your system performs consistently and efficiently, regardless of venue size or acoustics.

DEEP Mode for Enhanced Low Frequencies

For bass-heavy genres and applications requiring intensified low-frequency response, the KS118 features a DEEP mode that reallocates amplifier power to deliver deeper, more impactful bass. This mode enhances the subwoofer's ability to reproduce the lowest frequencies with increased punch and rumble, ideal for modern electronic music or high-energy performances. Activating DEEP mode transforms the KS118 into a powerhouse for situations where maximum bass extension and intensity are required. With this feature, the KS118 provides unmatched flexibility for achieving powerful and dynamic low end.

Durable Speaker Build for Road-Ready Reliability

The KS118 is built to withstand the rigors of live sound environments, featuring a birch cabinet, steel grille and robust hardware. Despite its high-performance capabilities, the subwoofer remains portable, with ergonomic handles and integrated casters that simplify transportation. Weighing in at 104 lb., the KS118 is manageable for its size, making it an excellent choice for touring professionals. Additionally, the standard M20 pole mount allows easy integration with full-range loudspeakers for a complete system. The durable construction ensures the KS118 remains reliable and functional throughout demanding road use.

Subwoofers Ideal for Live Sound Professionals

The QSC KS118 18 active subwoofer offers unmatched power, precision, and portability for live sound professionals who demand reliable low end performance. Its advanced DSP, DEEP mode and robust build make it the perfect addition to high-powered sound systems for concerts, events, and installations. Whether you need impactful bass for a cardioid array or a full-range setup, the KS118 provides the tools and technology to meet your needs. Invest in the KS118 and bring thunderous bass to every performance.