{"product_id":"sx218-2x18-direct-radiating-reflex-loaded-subwoofer-3000w-black","title":"SX218+ 2x18\" Direct Radiating Reflex-Loaded Subwoofer 3000W Black","description":"\u003cp\u003eThe SX218+ delivers very high output levels and superb transient performance with minimal distortion, making it ideal for the most demanding applications. With an operating range of 38 Hz–100 Hz ± 3 dB, it houses dual 18 in (460 mm) long‑excursion drivers with 4 in (100 mm) voice coils, water‑resistant cones and triple‑roll surrounds. Each driver is rated to handle 1500 watts AES and has a magnet structure and suspension engineered for maximum linear excursion.\u003c\/p\u003e\n\u003cp\u003eThe enclosure is constructed from multi‑laminate birch ply and finished with a durable polyurethane coating. Eight reflex ports provide a large frontal area to reduce turbulent air noise, and a perforated steel grille protects the drivers from damage. The internal port geometry promotes laminar airflow.\u003c\/p\u003e\n\u003cp\u003eThe SX218+ features an M20 pole‑mount insert for mounting point‑source speakers. Cabinet wheels and a transit cover are available as accessories.\u003c\/p\u003e\n\u003cp\u003eCompared with the SX218, the SX218+ is an all‑new design with enhanced performance and features. It is slightly deeper, so it uses a new transit cover, and it includes new drivers and an improved cabinet. Unlike the SX218, which required two 8 ohm amplifier channels, the SX218+ uses a single 4 ohm amplifier channel.\u003c\/p\u003e\n\u003cp\u003eThe SX218+ adds a third NL4 input connector on the front to improve cabling for subwoofers used in cardioid configurations. For outdoor use, you no longer need a WRKIT, but you must seal all three NL4 sockets. Use the correct cable connectors (NLT4FX or NLT4FX‑BAG) for connected sockets and install a Martin Audio weatherproof NL4 sealing plug in any unused socket.\u003c\/p\u003e\n\u003cp\u003eThe SX218+ adds a channel crossover on the link output, letting you run two cabinets from independent amplifier channels down a single four core cable. The SX218+ has two LED indicators, one on the front and one on the back, which you can illuminate via Vu‑Net software to identify each enclosure on the circuit. The rear LED is intended for use in cardioid setups.\u003c\/p\u003e\n\u003ch2\u003eProduct Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDual-driver, direct radiating reflex-loaded subwoofer\u003c\/li\u003e\n\u003cli\u003e2 x 18” (460mm) long-excursion drivers, 4” (100mm) voice coils, neodymium motors, waterproof cones\u003c\/li\u003e\n\u003cli\u003eVery high output capability\u003c\/li\u003e\n\u003cli\u003eTour-grade plywood enclosure with M10 mounting points\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eType:  Compact, direct radiating reflex-loaded subwoofer\u003c\/li\u003e\n\u003cli\u003eFrequency Response:  38Hz – 100Hz ±3dB, -10dB @ 31Hz\u003c\/li\u003e\n\u003cli\u003eDriver:  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\u003c\/li\u003e\n\u003cli\u003eRated Power:  3000W AES, 12000W peak\u003c\/li\u003e\n\u003cli\u003eRecommended Amplifier:  iK42 bridged for full output\u003c\/li\u003e\n\u003cli\u003eSensitivity:  102.5 dB\u003c\/li\u003e\n\u003cli\u003eMaximum SPL:  137dB continuous, 143dB peak, 149dB peak with crest factor 4\u003c\/li\u003e\n\u003cli\u003eNominal Impedance:  4 ohms\u003c\/li\u003e\n\u003cli\u003eDispersion (-6dB):  Omni-directional or cardioid when paired\u003c\/li\u003e\n\u003cli\u003eEnclosure:  Multi-laminate birch ply\u003c\/li\u003e\n\u003cli\u003eFinish:  Textured black or white paint\u003c\/li\u003e\n\u003cli\u003eProtective Grille:  Black or white perforated stainless steel\u003c\/li\u003e\n\u003cli\u003eEnvironmental Testing:\n\u003cul\u003e\n\u003cli\u003eIP rating IP21\u003c\/li\u003e\n\u003cli\u003eMIL-STD-810H\u003c\/li\u003e\n\u003cli\u003eISO 4892-2 Solar Radiation\u003c\/li\u003e\n\u003cli\u003eISO 12944-6 Category C3 Corrosion resistance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eLED Indicators:  Two LEDs: one front, one rear (rear LED for cardioid subs)\u003c\/li\u003e\n\u003cli\u003eConnectors:\n\u003cul\u003e\n\u003cli\u003e3 x NLT4MPXX-BAG (one front, two rear)\u003c\/li\u003e\n\u003cli\u003eIP54 weather‑resistant seal with NLT4FX, NLT4FX‑BAG or weatherproof NL4 sealing plug\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003ePIN Connections (Input on Front) 1+\/1-\u003c\/li\u003e\n\u003cli\u003ePIN Connections (Input on Rear) 1+\/1-\u003c\/li\u003e\n\u003cli\u003ePIN Connections (Link on Rear):\u003c\/li\u003e\n\u003cli\u003e1+\/1- linked to 2+\/2-\u003c\/li\u003e\n\u003cli\u003e2+\/2- linked to 1+\/1-\u003c\/li\u003e\n\u003cli\u003eFittings:\n\u003cul\u003e\n\u003cli\u003eTwo skids on base, with mating channels on top\u003c\/li\u003e\n\u003cli\u003eM20 thread plate on right side for pole mounting with sub \u003cbr\u003ein portrait\u003c\/li\u003e\n\u003cli\u003e24 x M10 mounting points, 6 on top, 6 on bottom, 4 on left, 4 \u003cbr\u003eon right, 4 on back\u003c\/li\u003e\n\u003cli\u003e4 x bar handles, two on each side\u003c\/li\u003e\n\u003cli\u003e16 x M8 inserts for optional castors\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions (incl skids):\n\u003cul\u003e\n\u003cli\u003e(W) 1084 mm × (H) 530 mm × (D) 799 mm (927 mm with castors, transit‑cover brackets add 28 mm)\u003c\/li\u003e\n\u003cli\u003e(W) 42.7 in × (H) 20.9 in × (D) 31.5 in (36.5 in with castors, transit‑cover brackets add 1.1 in)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeight:  82.3 kg (181 lb), 85.5 kg (189 lb) with castors\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Martin Audio","offers":[{"title":"Default Title","offer_id":56536587501946,"sku":"MAUSX218PLUS","price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0511\/4245\/9568\/files\/WEBMAU00579_SX218PLUS_3.webp?v=1775564694","url":"https:\/\/leisuretec.co.uk\/products\/sx218-2x18-direct-radiating-reflex-loaded-subwoofer-3000w-black","provider":"Leisuretec Distribution Ltd","version":"1.0","type":"link"}