The Martin Audio SX218 is a high-output dual 18” passive subwoofer designed for professional sound reinforcement systems where powerful, extended low frequency performance is required. It is suitable for live sound, touring, theatres, concert halls, clubs, houses of worship, arenas, corporate events and demanding fixed installations where strong bass output and low distortion are essential. Built around two long-excursion 18” drivers with 4” voice coils, the SX218 delivers very high output levels with strong transient response and controlled low frequency performance. Each driver uses a water-resistant cone and triple roll surround, while the cabinet’s eight reflex ports provide a large frontal area to help reduce turbulent air noise at high output levels. With 2000W AES power handling and 8000W peak capability, the SX218 is designed for systems requiring serious sub-bass impact and significant headroom. Its dual 8Ω driver configuration allows each driver to be powered individually, with the cabinet operated using suitable amplification and dedicated DSP processing. Correct amplifier matching, crossover configuration and limiter setup are important to achieve reliable performance and full system integration. The SX218 has a frequency response of 35Hz–150Hz ±3dB, with low frequency extension down to 30Hz at -10dB. This makes it suitable for applications where deep bass extension and high SPL capability are both required. It can be used as a standalone subwoofer, stacked with additional units or configured in cardioid arrays when paired and processed correctly. The cabinet is constructed from multi-laminate birch/poplar plywood and finished with a durable black Polyurea coating for professional touring and installation use. It includes four bar handles, skids with mating channels for stacking, an M20 pole mount insert, 24x M10 mounting points and fittings for optional accessories including castors, transit cover and weatherised connector protection. The Martin Audio SX218 is a strong choice for professional systems requiring substantial dual 18” subwoofer performance, flexible deployment and robust cabinet construction. Its combination of deep low frequency extension, high power handling and installation-ready features makes it well suited to demanding live sound and fixed venue applications.

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The Martin Audio SXH218 is a high-performance dual 18” passive subwoofer designed for demanding professional sound systems where maximum low frequency output, strong projection and excellent bass impact are required. Using Martin Audio’s Hybrid horn/reflex loading, the SXH218 combines the efficiency and punch of horn-loaded bass with the low frequency extension of a reflex design, making it suitable for large-scale live sound, premium venues, nightclubs, theatres, concert spaces and high-output fixed installations. At the heart of the SXH218 are two long-excursion 18” neodymium drivers, each with a 4.5” voice coil and waterproof cone. This driver configuration delivers substantial low frequency output with excellent transient response and headroom. With 3,400W AES power handling and 13,600W peak capability, the SXH218 is designed for serious bass reinforcement where standard compact subwoofers may not provide the required output or low-end authority. The SXH218 offers a frequency response of 32Hz–150Hz ±3dB, with extension down to 27Hz at -10dB. This makes it suitable for systems requiring deep, controlled bass across live music, club, event and installation environments. It is also an ideal partner for Martin Audio Wavefront Precision systems where high-output ground-stacked subwoofers are required. With a maximum SPL of 148dB peak, or 154dB peak with crest factor 4, the SXH218 is built for applications where significant low frequency energy is required across larger audience areas. It can operate in standard omnidirectional configurations or be used in cardioid arrangements when paired and processed correctly, helping reduce rearward bass energy and improve low frequency control on stage or behind the array. The enclosure is constructed from multi-laminate birch/poplar plywood and finished in hard-wearing black textured paint. The cabinet includes skids, mating channels, six bar handles and rear-mounted castors, supporting practical handling, stacking and deployment in professional environments. Its ground-stack format makes it well suited to touring, event production and permanent installations where flown subwoofers are not required. The updated SXH218 includes three NLT4MPXX-BAG connectors, with one front-mounted input and two rear connectors for improved cabling flexibility, especially in cardioid configurations. Front and rear LED indicators also support cabinet identification via Vu-Net, with the rear LED designed to assist cardioid subwoofer setup. The Martin Audio SXH218 is a premium choice for professional systems requiring very high-output dual 18” subwoofer performance with deep extension, horn/reflex efficiency and robust deployment features. It is particularly suited to large venues, high-energy music systems, touring productions, nightclubs and demanding fixed installations where bass performance is a critical part of the overall system design.

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