JBL SRX818S | 18in - 129dB

JBL SRX 818S  (JBL SRX-818S Subwoofer)

18-Inch Passive Subwoofer for DJs, Touring, and Fixed Installations

The JBL SRX818S delivers deep, high-impact bass in a compact passive subwoofer designed for demanding live sound and installation environments. Whether you're touring, DJing, or outfitting a performance venue, the SRX818S offers rugged construction, optimized stacking features, and powerful low-frequency response ideal for music playback, voice reinforcement, or system augmentation.

JBL SRX818S Competitive Differences

• 18” JBL 2279H Differential Drive® LF transducer for high output and low distortion
• 2400W peak / 1200W program / 600W continuous power handling for reliable performance
• 129dB peak SPL with 95dB sensitivity
• M20 threaded pole mount for easy satellite speaker integration
• Stackable design with indexed feet supports standard and cardioid subwoofer arrays
• NL4 input and loop-thru connections with ±1 or ±2 pin selectable options
• Optimized presets for Crown ITech HD amps and dbx signal processors
• Durable 18mm plywood enclosure with Obsidian Duraflex™ finish

JBL SRX818S Description

The JBL SRX818S is a premium 18-inch passive subwoofer engineered for live performance and installation applications. It’s part of the SRX800 series, featuring JBL’s proprietary Differential Drive® transducer technology that delivers powerful low frequencies with less weight and greater efficiency. Its rugged cabinet is built from 18mm plywood and finished in Obsidian Duraflex™, making it highly durable while maintaining a clean, professional look. A standard M20 pole socket and indexed feet make it easy to deploy in a variety of setups—from stacked cardioid arrays to mobile DJ rigs. Designed for seamless integration with Crown amplifiers and dbx processors, the SRX818S also supports configuration and control via JBL’s Audio Architect software, giving professionals even greater flexibility in managing their sound system. Whether for fixed installations or on-the-road performance, this subwoofer is built to deliver consistent, high-quality bass.

SRX818S Features

• Premium JBL 18" 2279H Differential Drive® LF driver
• 2400W Peak / 1200W Program / 600W Continuous power handling
• Max SPL: 129dB peak / 123dB continuous
• Frequency range: 28Hz–150Hz (-10dB)
• Frequency response: 45Hz–150Hz (-3dB)
• 95dB sensitivity
• Passive operation with NL4 input and loop-thru connectors
• Selectable +/-1 or +/-2 pin settings
• 80Hz crossover frequency
• Indexed feet for stable stacking in standard and cardioid modes
• Ergonomic handles for easier transport
• Accepts optional JBL WK-4S caster kit
• Fully supported by Audio Architect software

SRX818S Specifications

• System type: Passive 18” subwoofer
• LF Driver: JBL 2279H 18” woofer
• Nominal impedance: 8 Ohm
• Input connectors: NL4 Input, NL4 Loop-thru
• Operational mode: Passive
• Enclosure: 18mm plywood with Duraflex™ coating
• Finish: Obsidian Duraflex™
• Grille: 14-gauge powder-coated steel with black cloth backing
• Suspension/Mounting: M20 threaded pole socket
• Handles: 4 ergonomic handles
• Casters: Compatible with JBL WK-4S kit (not included)
• Dimensions (H x W x D): 26.89in x 26.92in x 22.62in (683mm x 684mm x 575mm)
• Weight: 78 lbs (35.4kg)
• Shipping weight: 88 lbs (40.2kg)