Sound Barrier SWX118 — High-Output 18″ Passive Subwoofer
SWX118 Overview
The Sound Barrier SWX118 is a professional 18-inch passive subwoofer built for demanding sound reinforcement applications including touring systems, mobile productions, clubs, houses of worship, corporate AV, and performance venues. At its core is a high-efficiency, long-excursion 18-inch neodymium low-frequency driver with a 4.5-inch voice coil, delivering excellent thermal capacity and precise cone control under sustained high-output conditions. The hybrid horn-assisted resonant enclosure extends usable low-frequency bandwidth and enhances sensitivity, achieving 102 dB / 1W / 1m sensitivity and a 139 dB peak SPL rating. The SWX118 is well suited for audio engineers, system integrators, touring companies, and venue operators who require impactful, articulate bass in a compact, deployment-ready format.
The enclosure is constructed from tour-grade 18 mm multi-ply birch plywood with extensive internal bracing, and includes integrated handles, rigging points, and an M20 pole mount for fast, flexible deployment across a wide range of production environments.
Key Features
- 18″ Neodymium Low-Frequency Driver — Long-excursion design with a 4.5-inch voice coil for high power handling, superior thermal capacity, and precise cone control at sustained output levels
- Hybrid Horn-Assisted Resonant Enclosure — Enhances sensitivity and SPL output while extending usable low-frequency bandwidth for tight, musical bass reproduction
- 139 dB Peak SPL — Delivers the output headroom required for large-venue touring, club installs, and high-demand live production environments
- 102 dB Sensitivity (1W/1m) — High-efficiency design reduces amplifier load and supports scalable system configurations
- Frequency Response: 36 Hz – 300 Hz (-3 dB) — Broad low-frequency bandwidth suitable for live music reinforcement, DJ systems, and portable production rigs
- Integrated Interlocking Anti-Slip Grooves — Supports secure vertical stacking for multi-unit deployments, improving low-frequency coupling and overall system efficiency
- Tour-Grade 18 mm Multi-Ply Birch Plywood Cabinet — Extensive internal bracing minimizes resonance and maximizes acoustic efficiency under road conditions
- Road-Ready Hardware — Durable textured finish, perforated steel grille with acoustic backing, integrated handles, rigging points, and M20 pole mount for versatile deployment
Technical Specifications
| Driver Size | 18″ Neodymium Low-Frequency Driver |
| Voice Coil Diameter | 4.5 inches |
| Frequency Response | 36 Hz – 300 Hz (-3 dB) |
| Sensitivity | 102 dB / 1W / 1m |
| Maximum SPL | 139 dB Peak |
| Enclosure Type | Hybrid Horn-Assisted Resonant |
| Cabinet Material | 18 mm Multi-Ply Birch Plywood |
| Pole Mount | M20 |
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