Martin Audio SX118 – 18" Passive Direct-Radiating Subwoofer (Black)

Product Overview

The Martin Audio SX118 is a compact, high-performance, single-driver direct-radiating passive subwoofer designed to extend the low-frequency operating range of full-range sound systems to 47Hz while providing exceptional LF output from a compact enclosure. It is well-suited to touring sound reinforcement, permanent concert hall and theatre installations, stadium AV, and corporate events where high LF headroom is required from a manageable enclosure form factor. The tour-grade plywood enclosure with integrated flying inserts supports both ground-stacked and rigged deployment configurations. Available in black; SX118-W is the white finish variant.

Product Description

The SX118 is the single-driver 18" direct-radiating passive subwoofer in the Martin Audio SX Series, positioned above the 12" models for applications requiring greater low-frequency extension and output. The 18" (460mm) driver features a 4" (100mm) voice coil, long-excursion design, ferrite magnet structure, and a waterproof cone — providing high power handling capability and deployment flexibility across indoor and moderately outdoor exposed environments. The extended LF operating range to 47Hz supports applications where sub-bass content is musically or programmatically significant, including live music, theatrical productions, and high-impact corporate events. Tour-grade plywood construction with flying inserts supports the physical demands of touring and the precision of permanent installation. The SX118 has been updated since January 2019 from an earlier iteration with improved driver specification. It pairs naturally with Martin Audio WPS, WPC, and full-range line array systems where cohesive LF reinforcement is required across concert halls, theatres, ballrooms, sports stadiums, and houses of worship.

Key Features

• 18" Long-Excursion Driver — 460mm driver with 4" voice coil extends LF operating range to 47Hz for sub-bass programme content.
• Ferrite Magnet Structure — High-efficiency magnet assembly supports sustained high-power operation.
• Waterproof Cone — Extends deployment to moderately exposed outdoor environments.
• Tour-Grade Plywood Enclosure — High-durability construction supports touring and permanent installation requirements.
• Integrated Flying Inserts — Supports both ground-stacked and rigged overhead deployment.
• Compact Form Factor — High output from a manageable enclosure size relative to LF extension achieved.

Typical Applications

• Touring sound reinforcement for small and medium-sized venues
• Permanent installation in concert halls, theatres, and ballrooms
• House of worship main floor LF reinforcement systems
• Sports stadium and arena AV installations
• Corporate AV events requiring high LF headroom
• Auditoriums and multi-purpose performance rooms

Technical Specifications

Frequently Asked Questions

Is the SX118 a passive or powered subwoofer?

The SX118 is a passive subwoofer requiring an external power amplifier and DSP processor for crossover management and system alignment.

How does the SX118 differ from the SX212?

The SX118 uses a single 18" driver providing deeper LF extension (to 47Hz) and higher output than the dual-12" SX212, from a larger but still compact enclosure suited to touring and large permanent installs.

Can the SX118 be flown?

Yes. Integrated flying inserts support rigged overhead deployment in addition to ground-stacking.

Is the SX118 suitable for outdoor use?

The waterproof driver cone extends deployment to moderately exposed outdoor environments. For full outdoor weatherisation, consult dedicated weatherised products.

Has the SX118 been updated from earlier versions?

Yes. The SX118 was updated in January 2019 with an improved driver specification over the earlier iteration.

Is a white version available?

Yes. The SX118-W is the white finish variant for colour-matched permanent installations.

Where can I view the full Martin Audio SX subwoofer range?

Visit creationnetworks.net/collections/martin-audio for the complete SX Series lineup.