Features and Applications
Features
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Applications
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Product Details SXH218
SXH218 is a ground-stacked subwoofer for WPC and WPL systems needing maximum low-frequency output, as well as premium fixed installations such as nightclubs. It is specified for 148 dB peak at one metre, or 154 dB peak with crest factor 4.
Hybrid horn/reflex loading combines bass-horn efficiency and impact with reflex extension. Two long-excursion 18-inch neodymium drivers use 4.5-inch voice coils, water-resistant cones and triple-roll surrounds, covering a published 32–150 Hz ±3 dB range.
The separate SXHF218 version adds flying hardware for placement above or alongside WPL arrays. Both versions support prescribed forward- and rear-facing combinations for directional bass configurations.
iK42 provides the published amplifier configurations using one channel or an approved bridged pair for maximum output. Connection wiring allows two subwoofers to use independent circuits over one four-core cable. VU-NET parameter sets supply the system settings with iK42; settings for alternative amplifiers are published by Martin Audio.
Four castors are supplied with SXH218. A transit cover is an optional accessory.
The Q2 2026 hardware update adds front and rear identification LEDs and a front NL4 connection, giving three NL4 sockets in total. Revised grille and connector hardware support the updated environmental specification. VU-NET can illuminate the LEDs, including the rear indicator used in cardioid setups.
The front socket simplifies rear-facing cabinet wiring. The revised connection arrangement does not require WRKIT, but all three NL4 positions must be sealed. NLT4FX or NLT4FX-BAG cable connectors and Martin Audio weatherproof plugs provide the stated IP54 connection protection; this is distinct from the cabinet environmental rating.
Explore the Martin Audio SX subwoofers at B-Star for the available system options.
Technical Specifications SXH218
ACOUSTICS |
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| TYPE | Hybrid® horn/reflex subwoofer |
| FREQUENCY RESPONSE (1) | 32Hz – 150Hz ±3dB, -10dB @ 27Hz |
| DRIVERS | 2 x 18” (460mm)/4.5” (115mm) voice coil, long excursion, neodymium magnet, waterproof cone |
| RATED POWER (2) | 3,400 W AES, 13,600 W peak |
| SENSITIVITY (10) | 107dB |
| MAXIMUM SPL (9) | 142dB continuous, 148dB peak, 154dB peak with crest factor 4 |
| NOMINAL IMPEDANCE | 4 Ohms |
| DISPERSION AT −6 dB | Omnidirectional, or cardioid when paired |
EXTERNAL PROCESSING AND AMPLIFICATION |
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| RECOMMENDED AMPLIFIER | iKON iK42 bridged for full output |
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/poplar ply |
| FINISH | Hard-wearing textured black paint (RAL 9005) |
| PROTECTIVE GRILLE | Black perforated steel |
| FITTINGS | Two skids with mating channels in the top; four rear-mounted 100mm (4in) castors included; 6 × bar handles, 3 per side; 4 × fixing points for optional transit cover |
| ACCESSORIES | Transit cover SXH218TC Weatherproof NL4 sealing plug |
| 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) 1112mm × (H) 609mm × (D) 1023mm (1151mm including castors); (W) 43.8in × (H) 24in × (D) 40.3in (45.3in including castors) |
| WEIGHT | 124 kg (273 lbs), with castors 127.5 kg (281 lbs) |
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