Its Hybrid® horn/reflex loading combines the acoustic efficiency and impact of bass horn technology with the low frequency extension of a reflex design, enabling it to produce significantly higher output levels than a traditional reflex-loaded subwoofer. With an operating range of 32-150Hz + 3dB, it features dual long-excursion 18” (460mm)/4.5” (115mm) voice coil neodymium drivers, with water resistant cones and triple roll surrounds.

The enclosure is constructed from multi-laminate plywood and coated with hard-wearing textured black polyurea. A rigid perforated steel grille protects the front of the enclosure, while integral flying hardware alongside use of the WPL GRIDt means it can be incorporated at the top of a WPL array, or more commonly flown as a separate array alongside, again using the WPL GRIDt. Like the ground-stack version, a combination of forward and rear-facing enclosures can be configured with specific directional properties. By adding an outrigger kit, SXHF218’s can also be ground-stacked beneath WPL enclosures to form a powerful ground-based system.

The SXHF218 can be powered by either a single channel of a Martin Audio iK42 4-channel amplifier, or a bridged pair if maximum output is required. Its connector sockets are wired so that one four-core cable from the amplifier will power two subwoofers. SXHF218 settings are determined by a pre- determined parameter set in Vu-Net when used in conjunction with iK42, or Settings are available from the Martin Audio website when used with alternative amplifiers.

By adding the input board cover accessory, the subwoofer is fully weather resistant and suitable for outdoor usage.