Features and Applications
Features
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Applications
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Product Details SX218+
SX218+ uses two long-excursion 18-inch neodymium drivers with 4-inch voice coils, water-resistant cones and triple-roll surrounds. Each handles 1500 W AES; the published operating range is 38–100 Hz ±3 dB.
Eight large reflex ports reduce turbulent airflow, with revised internal geometry promoting laminar flow. The multi-laminate birch cabinet has polyurethane paint and a protective perforated steel grille.
An M20 pole fitting supports compatible point-source loudspeakers. Handles, locating skids and M10 mounting points support the specified deployment arrangements.
The 2026 design uses new drivers and an improved cabinet compared with SX218. Its greater depth require the model-specific transit cover. Wheels and a cover are optional accessories. It uses one 4-ohm amplifier channel, whereas SX218 uses two 8-ohm circuits.
A third NL4 socket on the front simplifies cabling when a cabinet faces backwards in a cardioid arrangement. Outdoor connections no longer use the older WRKIT, but all three sockets must be sealed: NLT4FX or NLT4FX-BAG connectors on cabled sockets and Martin Audio weatherproof plugs on unused sockets.
A channel crossover on the link output allows two cabinets to run from independent amplifier channels through one four-core cable. Front and rear LEDs can be illuminated through VU-NET to identify cabinets on the circuit. The rear LED supports identification in cardioid setups.
Explore the Martin Audio SX subwoofers at B-Star for the available system options.
Technical Specifications SX218+
ACOUSTICS |
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| TYPE | Dual-driver, direct-radiating reflex-loaded subwoofer |
| FREQUENCY RESPONSE (1) | 38Hz – 100Hz ±3dB, -10dB @ 31Hz |
| DRIVERS | 2 x 18 in (460 mm) long-excursion drivers with 4 in (100 mm) aluminium voice coils, neodymium motors with T-poles and demodulation rings, waterproof cones |
| RATED POWER (2) | 3000W AES, 12000W peak |
| SENSITIVITY (3) | 102.5 dB |
| MAXIMUM SPL (2) (3) | 137dB continuous, 143dB peak; 149dB peak with crest factor 4 |
| NOMINAL IMPEDANCE | 4 ohms |
| DISPERSION AT −6 dB | Omnidirectional, or cardioid when paired in the specified configuration |
EXTERNAL PROCESSING AND AMPLIFICATION |
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| RECOMMENDED AMPLIFIER | iK42 bridged for full output; For details, see SX218+ User Guide |
CONNECTIONS AND INDICATORS |
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| LED INDICATORS | Two LEDs, one front and one rear; rear LED for cardioid subwoofer operation |
| CONNECTORS | 3 × NLT4MPXX-BAG connectors (one front, two rear); IP54 weather seal with NLT4FX, NLT4FX-BAG or weatherproof NL4 blanking plugs |
| FRONT INPUT PIN CONNECTIONS | 1+/1− |
| REAR INPUT PIN CONNECTIONS | 1+/1− |
| REAR LINK PIN CONNECTIONS | 1+/1− linked to 2+/2−; 2+/2− linked to 1+/1− |
ENCLOSURE, MOUNTING AND ENVIRONMENT |
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| ENCLOSURE | Multi-laminate birch ply |
| FINISH | Textured black or white paint |
| PROTECTIVE GRILLE | Black or white perforated stainless steel |
| FITTINGS | Two skids with mating channels in the top; right-side M20 threaded plate for pole mounting with the subwoofer upright; 24 × M10 fixing points: 6 top, 6 bottom, 4 left, 4 right, 4 rear; 4 × bar handles, two per side; 16 × M8 inserts for optional castors |
| ACCESSORIES | Four-castor WHEELKIT; M10 HTKCT06 eyebolts; weatherproof NL4 blanking plugs; SX218GRID installation flying frame; SX218FKIT flying kit; SX218+TC transit cover |
| ENVIRONMENTAL TESTING | IP21; MIL-STD-810H; ISO 4892-2 solar radiation; ISO 12944-6 Category C3 corrosion resistance |
DIMENSIONS AND WEIGHT |
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| DIMENSIONS INCLUDING SKIDS | (W) 1091 mm × (H) 538 mm × (D) 827 mm (955 mm with castors); (W) 43.0 in × (H) 21.2 in × (D) 32.5 in (37.6 in with castors) |
| WEIGHT | 82.3 kg (181 lb), 85.5 kg (189 lb) with castors |
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