The SRX918SF is a powered 18-inch subwoofer designed for use in suspended or ground-stacked configurations with SRX900 Series full-range systems. It features an integrated three-point rigging system that supports standalone arrays or combined deployment with SRX910LA cabinets. The subwoofer contains a JBL 2279-1 18-inch woofer utilizing Differential Drive technology, which incorporates dual voice coils and dual magnetic gaps to enhance heat dissipation and reduce power compression.

The unit includes built-in digital signal processing (DSP) and amplification for consistent performance and simplified setup. The cabinet is constructed from 18 mm birch plywood and incorporates a large low-frequency port designed to optimize airflow and minimize audible turbulence at high output levels. Control of the system is provided via compatible software available for Windows, macOS, and iPadOS platforms.

• High-performance, high-density system in truck-pack friendly format
• High-power-handling transducers with low distortion and class-leading output
• Built-in, passively-cooled Class D amplification with universal power supply
• Dual Ethernet ports with Neutrik etherCON connectors
• Control and configuration with JBL Performance software over HARMAN's HControl protocol
• User-controllable DSP
• LevelMax limiting with excursion-control algorithms to protect transducers
• Rear-panel LCD for control access
• Reinforced birch plywood enclosures
• M20 threaded mount for pole mounting or ground stacking
• Integrated three-point rigging system

Frequency Range	35 Hz - 100 Hz
Coverage Pattern	Omnidirectional or Cardioid
Maximum SPL	134 dB
System Type	Powered Subwoofer
Amplifier Design	Class-D
Continuous Power Rating	1,100 W
LF Driver	JBL 2279G-1, 18 in, 4 ohms, dual 3.0 in voice coil, ferrite Differential Drive
Enclosure	Exterior grade birch plywood, Black DuraFlex finish