JBL SRX918SF 18-Inch Powered Flyable Subwoofer

JBL SRX918SF 18-Inch Powered Flyable Subwoofer

The JBL SRX918SF 18-inch powered flyable subwoofer is a professional active bass system built for suspended or ground-stacked SRX900 deployments. Its Differential Drive woofer, 1,100-watt Class-D amplifier, onboard DSP, and 134 dB peak output deliver controlled low-frequency reinforcement down to 35 Hz for touring and installed sound.

This powered flyable subwoofer for touring supports rental companies, production teams, DJs, houses of worship, theaters, and permanent venues. A large bass-reflex port improves airflow and reduces audible turbulence at high output levels. Omnidirectional and cardioid presets give system engineers flexible pattern control, while 60 Hz and 80 Hz operating modes simplify integration with SRX900 full-range loudspeakers.

The cabinet shares its width and suspension hardware with the SRX910LA, enabling compatible flown and ground-stacked mixed arrays. HARMAN HControl networking, dual etherCON ports, and JBL Performance software provide system configuration through Windows, macOS, and iPadOS. Reinforced birch-plywood construction, three-point rigging hardware, an M20 pole socket, and conditional IP54 protection support demanding professional deployments.

Key Features

• 18-Inch Differential Drive Woofer: Dual 3-inch voice coils improve heat dissipation, reduce power compression, and support wide dynamic range.
• High-Output Bass Performance: Delivers frequencies down to 35 Hz and produces up to 134 dB peak SPL.
• Integrated Class-D Amplification: Supplies 1,100 watts continuously and 2,500 watts peak without an external amplifier rack.
• Configurable Coverage: Omnidirectional and cardioid presets provide flexible low-frequency pattern control for different venues.
• Advanced Onboard DSP: Includes 24 adjustable filters, 2,000 ms of delay, FIR processing, and system-optimization tools.
• Networked System Management: Dual etherCON ports support HControl networking and JBL Performance software operation.
• Flexible Deployment: An integrated three-point rigging system supports standalone flown arrays and mixed configurations with compatible loudspeakers.
• Durable Touring Construction: Reinforced exterior-grade birch plywood, a steel grille, recessed handles, and a DuraFlex finish withstand professional use.

Technical Specifications

System Performance

• System Type: Powered subwoofer
• Enclosure Type: Bass-reflex
• Frequency Range: 35 Hz to 100 Hz at -10 dB with 80 Hz preset
• Frequency Response: 45 Hz to 80 Hz at -3 dB with 80 Hz preset
• Operating Modes: 60 Hz and 80 Hz
• Coverage Options: Omnidirectional or cardioid, determined by preset and cabinet configuration
• Maximum Peak Output: 134 dB SPL

Transducer

• Low-Frequency Driver: One JBL 2279G-1 18-inch Differential Drive woofer
• Nominal Impedance: 4 ohms
• Voice Coil: Dual 3-inch voice coils
• Magnet Material: Ferrite

Amplifier

• Amplifier Type: Class-D
• Amplifier Channels: One
• Continuous Power: 1,100 watts
• Peak Power: 2,500 watts
• Cooling: Convection cooling with an external aluminum heat sink and internal on-demand fan

Digital Signal Processing

• Sample Rate: 48 kHz
• Bit Depth: 24-bit
• User-Adjustable Filters: 24
• Maximum Alignment Delay: 2,000 ms
• DSP Functions: Delay, FIR filtering, Array Size Compensation, and Throw Distance Correction
• Protection Processing: LevelMax limiting with excursion-control algorithms
• User Interface: LCD, encoder, Back button, three single-color LED indicators, and one bi-color LED indicator
• Control Software: JBL Performance
• Supported Platforms: Windows, macOS, and iPadOS

Audio Connections

• Input Type: Balanced line level
• Audio Connectors: One Neutrik 3-pin XLR input and one Neutrik 3-pin XLR output
• Nominal Input Sensitivity: +6 dBu
• Maximum Input Level: +21 dBu
• Input Impedance: 100 kΩ
• USB I/O: None
• Wireless Connectivity: None

Networking

• Network Type: TCP/IP
• Network Protocol: HARMAN HControl
• Network Speed: Dual 100 Mbps ports
• Network Connections: Two Neutrik etherCON ports

AC Power

• Nominal Voltage Range: 100 to 240 VAC, 50/60 Hz
• Operating Voltage Limits: 80 to 260 VAC, 50/60 Hz
• Power Connections: Neutrik powerCON TRUE1 input and output
• 100V Current Draw: 0.2 A standby, 0.3 A idle, 4.7 A continuous, 20.5 A maximum instantaneous peak, and 2.6 A peak inrush
• 120V Current Draw: 0.2 A standby, 0.3 A idle, 4.0 A continuous, 18.1 A maximum instantaneous peak, and 3.1 A peak inrush
• 208V Current Draw: 0.2 A standby, 0.2 A idle, 2.1 A continuous, 8.6 A maximum instantaneous peak, and 5.2 A peak inrush
• 240V Current Draw: 0.1 A standby, 0.2 A idle, 1.9 A continuous, 7.3 A maximum instantaneous peak, and 6.0 A peak inrush

Construction and Mounting

• Cabinet Construction: 0.71-inch exterior-grade birch plywood
• Finish: Black DuraFlex, RAL 9004
• Grille: Powder-coated 14-gauge hex-perforated steel with acoustically transparent black cloth backing
• Handles: Two integral recessed handles
• Pole Mount: One top-mounted M20 threaded socket
• Suspension System: Three captive suspension plates with quick-release pins and an anti-corrosion coating
• Environmental Rating: IP54 when used with the compatible SRX900 RC1 rain cover and positioned at a downward angle that permits drainage
• Environmental Testing: IEC 60529, ASTM B117, and ASTM G154
• Recommended Environment: Indoor or covered outdoor use with nominal humidity below 50% and away from corrosive materials
• Dimensions (H x W x D): 22.7" x 28" x 27"
• Net Weight: 120 lbs
• Shipping Weight: 144 lbs
• Package Dimensions (L x W x H): 33" x 31.75" x 25.5"
• Manufacturer SKU: JBL-P3366MX

What's In the Box

• JBL SRX918SF Powered Flyable Subwoofer
• Neutrik NAC3F-TRUE1-S Power Connector
• Neutrik NAC3M-TRUE1-S Power Connector

Power Cord: Not included