JBL SRX918SF 18" Powered Flyable Subwoofer – High-Performance SRX900 Series

Product Overview

The JBL SRX918SF is an 18-inch powered flyable subwoofer built for professional sound reinforcement — touring productions, rental inventory, and permanent installs that require high SPL, network control, and a single-box solution. As the self-powered model in the SRX900 Series, it delivers 134 dB peak output with a built-in Class-D amplifier, eliminating the need for a separate amplifier rack without compromising low-frequency performance. Its integrated three-point rigging system makes it a practical choice as a JBL SRX900 flyable subwoofer for both flown and ground-stacked configurations. System designers specifying powered touring subwoofers for large-venue reinforcement will find the SRX918SF's onboard DSP, FIR correction, and HARMAN network control essential for complex multi-cabinet deployments.

Product Description

The SRX918SF uses an 18-inch Differential Drive® woofer with dual 3-inch voice coils and a ferrite magnet structure, driven by a passively cooled 1,100 W RMS (2,500 W peak) Class-D amplifier. Frequency response extends to 35 Hz (-10 dB), providing the sub-40 Hz extension needed for music playback and large-scale concert reinforcement. The large low-frequency port reduces port turbulence at high drive levels, keeping output clean through the entire dynamic range.

Onboard DSP provides 24 adjustable filters, up to 2,000 ms of delay for time-alignment in distributed systems, and FIR-based throw-distance correction with array size compensation. These tools make the SRX918SF effective as a professional touring subwoofer with DSP control when paired with SRX900 full-range tops or other compatible cabinets. The rear-panel LCD gives direct access to system presets without a connected device, while dual Neutrik etherCON ports support HARMAN HControl for remote monitoring and parameter adjustment via JBL Performance Manager software on Windows, macOS, and iPadOS.

The enclosure is constructed from 0.7-inch reinforced plywood with a powder-coated perforated steel grille. The integrated three-point rigging system supports flown deployments, and an M20 threaded pole-mount socket allows stacking full-range SRX900 tops directly on the sub. A powerCON TRUE1 power pass-through simplifies cable runs in multi-cabinet setups. At 120 lb, the SRX918SF is designed to truck-pack efficiently on touring productions while meeting the structural demands of fixed installation rigging.

Key Features

• 18-inch Differential Drive® Woofer — Dual 3-inch voice coils and ferrite magnet deliver linear bass response to 35 Hz (-10 dB) with controlled excursion at high drive levels.
• 1,100 W RMS Class-D Amplifier — Passively cooled design with universal 100–240 VAC power supply; 2,500 W peak output eliminates the need for an external amplifier.
• 134 dB Peak SPL — Sufficient output for large-venue concert reinforcement, festivals, and high-demand touring productions.
• Onboard DSP with 24 Filters — Parametric EQ, high-pass/low-pass filters, limiter, and subharmonic synthesis configurable from the rear-panel LCD or via software.
• FIR-Based Throw-Distance Correction — Maintains phase coherence with full-range tops at varying distances; array size compensation presets support cardioid sub configurations.
• 2,000 ms Delay — Enables precise time-alignment with front-fills, balcony delays, or other system zones in distributed reinforcement systems.
• Dual Neutrik etherCON Ports — HARMAN HControl Ethernet protocol supports full remote control via JBL Performance Manager on Windows, macOS, and iPadOS.
• Rear-Panel LCD — Direct access to presets and parameter adjustments without a connected computer, practical for fast deployment at live events.
• Three-Point Integrated Rigging System — Supports flown and ground-stacked use; M20 threaded pole-mount socket accommodates SRX900 full-range tops directly.
• powerCON TRUE1 Pass-Through — Simplifies power distribution in multi-cabinet touring and installed systems.
• Truck-Pack-Friendly Enclosure — 0.7-inch reinforced plywood construction sized for efficient loading in standard touring vehicles.

Typical Applications

• Auditorium and large multi-purpose venue sound reinforcement
• House of worship systems requiring extended low-frequency coverage
• Touring and rental production inventory
• Fixed installation systems with network-controlled DSP
• Festival and outdoor stage audio requiring flyable, self-powered subwoofers

Technical Specifications

Frequently Asked Questions

What full-range speakers pair with the SRX918SF? The SRX918SF is designed to integrate with the JBL SRX900 Series full-range tops, including the SRX906LA line array element and SRX912M stage monitor. Its onboard DSP includes SRX900 system presets that align level, time, and crossover for consistent voicing and phase coherence across the system.

Can the SRX918SF be flown? Yes. It includes an integrated three-point rigging system designed for flown deployment. Always use certified rigging hardware rated for the cabinet weight and consult a structural engineer for venue-specific rigging designs. The M20 threaded pole socket is for ground-stacked use with tops only, not aerial rigging.

Does the SRX918SF support cardioid subwoofer configurations? Yes. The onboard DSP includes array size compensation presets that support standard and cardioid subwoofer array configurations, reducing rear-stage spill in applications where stage noise control is important.

How is the SRX918SF controlled remotely? Dual Neutrik etherCON ports support HARMAN's HControl Ethernet protocol. JBL Performance Manager software on Windows, macOS, and iPadOS provides full remote parameter control, monitoring, and preset management across networked SRX900 systems.

What is the warranty on the JBL SRX918SF? JBL Professional products are backed by a limited warranty. Contact Creation Networks for current warranty terms and to discuss service options: creationnetworks.net.

Is the SRX918SF suitable for permanent installation? Yes. Its network control capability, integrated rigging, and universal power supply make it appropriate for fixed installation systems in auditoriums, houses of worship, and performance venues — not just touring and rental applications.

What amplifier topology does the SRX918SF use? It uses a passively cooled Class-D amplifier, which reduces weight and thermal management complexity compared to Class-AB designs, while delivering 1,100 W RMS continuous output with a 2,500 W peak capacity.