JBL SRX918SF 2,500-watt 18-inch Powered Flyable Subwoofer

Designed to complement JBL’s full-range SRX900 loudspeakers, the SRX918SF is a high-performance powered subwoofer in a truck-pack-friendly format. This active sub houses a 18-inch low-frequency driver and a 2,500-watt Class D amplifier, delivering linear low end down to 35Hz and a mighty 134dB maximum SPL. Additionally, its large low-frequency port design enhances airflow and minimizes audible turbulence — even at high output levels. The SRX918SF offers user-controllable DSP, including limiting, filters, delay, and more. It also includes presets for cardioid configurations and optimal use alongside SRX900 loudspeakers. A rear-panel LCD screen provides access to the subwoofer’s control features, and complete configuration and control are available through JBL Performance software over Harman’s HControl protocol. Finally, the SRX918SF boasts a reinforced birch plywood enclosure and rugged Neutrik etherCON connectors for maximum durability, an M20 threaded mount for pole mounting or ground stacking, and an integrated 3-point rigging system. Whether stacked or flown, the JBL SRX918SF delivers class-leading low-frequency performance with superior dynamic range.

Powerful 18-inch driver and Class D amplifier

The SRX918SF delivers a transparent, linear low-frequency response down to 35Hz. Its 18-inch driver, equipped with dual 3-inch voice coils, leverages JBL’s patented Differential Drive technology to ensure ample power handling with minimal distortion. Additionally, the SRX918SF’s passively cooled Class D amplifier outputs an impressive 2,500 watts, enabling this subwoofer to achieve a class-leading 134dB maximum SPL.