18-inch Powered Subwoofer


18-inch Powered Subwoofer
The SRX900 Series embodies the advanced performance principles that drive JBL's development of audio products that make a real difference in the world of professional audio. This next-generation family of powered line arrays and subwoofers addresses the growing need for scalable small and medium-format professional sound-reinforcement solutions for rental companies, fixed installations and musicians seeking the ultimate combination of performance and portability.

The SRX918S is a single 18-inch active subwoofer designed to complement SRX900 Series full-range sound reinforcement systems. The subwoofer houses a JBL 2279-1 18-inch woofer featuring Differential Drive® – JBL’s dual voice coil, dual gap technology – to deliver better heat dissipation, lower power compression, and wider dynamic range than conventional single-coil designs.

Built-in DSP and amplification offer a plug and play experience while providing consistency and optimum performance anywhere in the world. The SRX918S incorporates a large low frequency port design that improves airflow and reduces audible turbulence, even at high output levels. A new, full-featured software package gives users control of the system on various platforms, including Windows, macOS, and iPad OS. Learn more about JBL Performance here.


  • High-performance, high-density system solution in a truck-pack friendly format
  • High-power-handling transducers deliver low distortion, high fidelity, and class-leading output
  • Built-in, passively cooled Class D amplification with a universal power supply
  • Dual Ethernet ports with Neutrik etherCON connectors
  • Supports HARMAN HControl Ethernet
  • User-controllable DSP
  • LevelMax limiting uses sophisticated excursion-control algorithms to protect transducers
  • Rear-panel LCD provides complete access to control features
  • Reinforced 18mm plywood enclosures


  Version Language Size Uploaded
file type icon SRX918S Spec Sheet
en version A, updated: May 2022
en  372 KB May 2022
file type icon SRX900 Series User Manual
en version B, updated: Mar 2023
en  9.32 MB Mar 2023
file type icon SRX900 Series Rigging Manual
en version C, updated: Mar 2023
en  38.5 MB Mar 2023
file type icon SRX918S Spare Parts
en version A, updated: Aug 2023
en  44.1 KB Aug 2023
file type icon Assembly Instructions - powerCON TRUE1 TOP
en version V3, updated: Mar 2023
V3  en  5.18 MB Mar 2023
CAD Drawings
file type icon SRX918S Customer Drawings
en version A, updated: May 2022
en  4.55 MB May 2022
file type icon SRX900 Series Revit Files
version 1.0, updated: May 2022
1.0    43.1 MB May 2022
file type icon SRX900 Series Sketchup Files
version 1.0, updated: May 2022
1.0    2.67 MB May 2022
platform icon Performance Software (MAC)
version, updated: Feb 2024     130 MB Feb 2024
platform icon Performance Software (Windows)
version, updated: Feb 2024     157 MB Feb 2024
platform icon Line Array Calculator III
version 3.9.0, updated: Feb 2024
3.9.0     24.2 MB Feb 2024
platform icon Performance Software (iPadOS)
updated: Oct 2023
    Oct 2023
platform icon SRX900 Plugin for Q-SYS
version 1.0.1, updated: Sep 2023
1.0.1     2.83 MB Sep 2023
platform icon SRX900 Module for AMX
updated: Sep 2023
    Sep 2023
file type icon SRX900 Series Firmware Changelog
en version, updated: Jan 2023  en  52.6 KB Jan 2023
Declaration Of Conformity
file type icon SRX900 Series EU Declaration of Conformity
en version A, updated: Jul 2022
en  1010 KB Jul 2022
Ease Data
file type icon SRX900 Series EASE GLL
version 1.0, updated: Jul 2022
1.0    14 MB Jul 2022

If any of the links above result in strange characters in your browser, please right-click the file to save it to your computer.

Parts & Service


Frequency Range (-10dB) 35 Hz-90 Hz (Preset: 80 Hz)
Coverage Pattern Omnidirectional or Cardioid
Maximum SPL 134 dB (Preset: 80 Hz)
System Type Active Subwoofer
Amplifier Design Class-D
Continous Power Rating 1,100 Watts
LF Driver (1) JBL 2279G-1, 18 in diameter, 4 ohms, dual 3.0 in diameter voice coil, ferrite Differential Drive®
Enclosure 18 mm plywood, Black DuraFlex finish, two integral recessed handles
Dimensions (H x W x D) 575 mm x 684 mm x 683 mm
(22.6 in x 26.9 in x 26.9 in)
Net Weight (each) 44.5 kg (98 lbs)


SRX918S CVR | Accessory Cover Kit for SRX918S
SRX918S CVR Main photo
Larger Images


  • Heavy-duty soft cover for SRX910LA enclosures
  • Covers four SRX910LA on a Vertical Transporter
  • Includes input panel flaps for testing purposes
  • Handle cutouts for easy transportation
  • Heavy-duty industrial-grade zippers


  • (1) Cover

SRX900 RC1 | Rain Cover, compatible with all SRX900 models
SRX900 RC1 Main photo
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  • Universal rain cover for SRX900 products
  • Supports: SRX906LA, SRX910LA, SRX918S, SRX928S
  • Flexible material for conforming to cables
  • Covers LCD, audio, and data connections
  • Unfolds for easy cable and LCD access
  • Designed to remain attached


  • (1) Rain Cover
  • (5) T15 M3.5 Screws

ACK1 | Accessory Caster Kit
ACK1 Main photo
Larger Images


  • Universal caster kit for JBL products
  • Compatible with SRX918S and SRX928S
  • Black housing for discreet look
  • Black polyurethane wheel
  • Anti-rattle features for vibration-free operation


  • (4) Casters + Installation Hardware













HARMAN Professional Solutions: