Martin Audio SXH218

The Martin Audio SXH218 is an ultra-high-output Hybrid® horn/reflex-loaded subwoofer engineered for the most demanding touring and installation applications. Featuring dual 18-inch long-excursion neodymium drivers with massive 4.5-inch voice coils, the SXH218 delivers exceptional low-frequency extension, outstanding efficiency, and extreme output capability. With peak SPL levels reaching up to 154dB (crest factor 4), it is the ideal low-frequency partner for large-scale line array systems such as Wavefront Precision WPC and WPL, as well as premium fixed installations including nightclubs, arenas, stadiums, and major entertainment venues.

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Key Features

• Ultra-high-output Hybrid® horn/reflex-loaded subwoofer
• Dual 18-inch long-excursion neodymium LF drivers
• High-power 4.5-inch voice coils
• Waterproof cone technology for maximum durability
• Exceptional low-frequency extension down to 27Hz
• Extremely high acoustic output capability
• Hybrid horn/reflex loading for maximum efficiency
• Forward-facing or rear-facing deployment options
• Suitable for omnidirectional or cardioid configurations
• Rugged touring-grade plywood enclosure
• Integrated transport castors
• Weather-resistant connectivity system
• LED status indicators for monitoring

Technical Specifications

• Type: Hybrid® Horn/Reflex Subwoofer
• Frequency Response: 32Hz – 150Hz (±3dB), -10dB @ 27Hz
• Drivers:
  • 2 × 18″ (460mm) Long-Excursion Drivers
  • 4.5″ (115mm) Voice Coils
  • Neodymium Magnet Structures
  • Waterproof Cones
• Power Handling: 3400W AES, 13600W Peak
• Recommended Amplifier:
  • iKON iK42 (Bridged for Full Output)
• Sensitivity: 107dB
• Maximum SPL:
  • 142dB Continuous
  • 148dB Peak
  • 154dB Peak (Crest Factor 4)
• Nominal Impedance: 4 Ohms
• Dispersion: Omnidirectional or Cardioid (When Paired)
• Enclosure Material: Multi-Laminate Birch/Poplar Plywood
• Finish: Hard-Wearing Textured Black Paint (RAL 9005)
• Grille: Black Perforated Steel
• Environmental Ratings:
  • IP21
  • MIL-STD-810H Tested
  • ISO 4892-2 Solar Radiation
  • ISO 12944-6 Category C3 Corrosion Resistance
• LED Indicators:
  • Front LED
  • Rear LED (For Cardioid Sub Configurations)
• Connectors:
  • 3 × NLT4MPXX-BAG
  • One Front Connector
  • Two Rear Connectors
• Weather Protection:
  • IP54 Seal with NLT4FX, NLT4FX-BAG or Weatherproof NL4 Sealing Plug
• Input Connections (Front):
  • 1+ / 1-
• Input Connections (Rear):
  • 1+ / 1-
• Link Connections (Rear):
  • 1+ / 1- Linked to 2+ / 2-
  • 2+ / 2- Linked to 1+ / 1-
• Handles:
  • 6 Bar Handles (3 per Side)
• Transport Features:
  • Two Base Skids with Mating Top Channels
  • Four Rear-Mounted 100mm Castors Supplied
• Additional Features:
  • 4 Fittings for Optional Transit Cover
• Dimensions (W × H × D):
  • 1112 × 609 × 1023 mm
  • 1112 × 609 × 1151 mm (Including Castors)
• Weight:
  • 124 kg (Without Castors)
  • 127.5 kg (With Castors)