The JBL SRX918S is a high-output 18-inch powered subwoofer designed to deliver deep, controlled bass for live sound reinforcement, touring systems, rental applications, and fixed installations. Part of the JBL SRX900 Series, it combines a powerful Differential Drive woofer, 1,100 watts of continuous Class D amplification, and advanced digital signal processing in a durable, transport-friendly enclosure. With a maximum SPL of 134 dB and selectable omnidirectional or cardioid operation, it provides flexible low-frequency reinforcement for professional sound systems.
JBL SRX918S Competitive Differences
134 dB Maximum SPL: Delivers high-output low-frequency performance for demanding live sound applications.
1,100W Continuous Class D Amplification: Integrated amplification provides powerful bass reinforcement without requiring an external amplifier.
18-Inch Differential Drive Woofer: JBL's dual voice coil, dual gap technology improves heat dissipation, reduces power compression, and supports a wide dynamic range.
Omnidirectional or Cardioid Operation: Configurable coverage allows users to optimize low-frequency dispersion for different venues and system arrangements.
Advanced Built-In DSP: User-adjustable processing and LevelMax limiting help optimize system performance while protecting the transducer.
Ethernet Network Control: Dual Neutrik etherCON ports support HARMAN HControl networking and remote system management.
JBL Performance Software Integration: Enables system configuration and control using compatible Windows, macOS, and iPadOS devices.
Rugged Plywood Construction: Reinforced 18mm plywood construction, a protective DuraFlex finish, and recessed handles support repeated transportation and professional use.
JBL SRX918S Description
The JBL SRX918S is engineered to complement JBL SRX900 Series full-range loudspeakers with powerful, controlled low-frequency reproduction. Its JBL 2279G-1 18-inch woofer features patented Differential Drive technology with dual 3-inch voice coils and a dual-gap magnetic structure. This design improves thermal management and reduces power compression, helping maintain consistent bass performance during demanding applications. A large low-frequency port improves airflow and reduces audible turbulence at high output levels.
Built-in Class D amplification delivers 1,100 watts of continuous power, while integrated DSP provides control over system tuning, processing, and protection. JBL LevelMax limiting uses advanced excursion-control algorithms to help protect the driver without unnecessarily compromising output. A rear-panel LCD provides direct access to essential settings, allowing operators to configure the subwoofer without additional external processing equipment.
For larger sound reinforcement systems, the SRX918S supports both omnidirectional and cardioid configurations. By arranging cabinets in supported configurations and selecting the appropriate DSP presets, users can tailor low-frequency coverage to the venue. Dual Ethernet ports with Neutrik etherCON connectors enable networked control through HARMAN HControl and JBL Performance software, making the system suitable for scalable installations and multi-cabinet deployments.
The enclosure is built from reinforced 18mm plywood with a black DuraFlex protective finish and two integrated recessed handles. Its compact, truck-pack-friendly dimensions make it practical for rental companies, production crews, and musicians who require reliable low-frequency performance in a transportable format. Optional caster kits, protective covers, and vertical transport accessories provide additional flexibility for storage and transportation.
SRX918S Features
Single 18-inch powered subwoofer for professional sound reinforcement
