hd Infra218

  • 2x 18“ High-Performance Hybrid Subwoofer 3600 W / 14400 W (RMS/Peak)
  • extended frequency response down to 28 Hz
  • 149 dB SPLmax
  • passive directivity for stacks of 3 units
  • 2x M20 threads
  • weight 89 kg

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hd Infra218

The hd Infra218 is a high-performance subwoofer for reproducing frequencies below 28 Hz. Compact dimensions and exceptional power reserves combined with minimal distortion make the hd Infra218 a modern and flexible tool for touring and installation applications requiring extreme low-frequency sound pressure and maximum control over dispersion. The optimally tuned, horn-shaped multiplex enclosure with bass reflex tuning accommodates two special 18″N high-performance chassis with a linear stroke of 30 mm and a load capacity of 14.4 kW. A large, flow-optimized center reflex port provides excellent air excitation with minimal turbulence and distortion. Thanks to its long throw range, high efficiency and passive directivity, the hd Infra218 can be optimally integrated into LineArray applications. Two M20 threads allow horizontal and vertical operation with distance rods. A Speakon turning socket in the protective grid allows cardioid configurations without an interchangeable cable.



Infra218 – Hybrid Subwoofer


Bass reflex system/horn-loaded


2x 18″ long excursion chassis
5“ voice coil, vented at pole piece and spider


active up to max. 120 Hz

Power handling capacity

3600 W / 14400 W

Frequency range

28 Hz – 120 Hz

Sensitivity (1 W / 1 m)

106 dB

Max. sound pressure (1 m)

149 dB

Nominal impedance

4 Ohms


2x Speakon NL4
1x Speakon NL4 turning socket

Dimensions (W x H x D)

1190 x 536 x 670 mm


89 kg


robust multiplex housing
Polyurethane coating black
recessed connection panel with 2x NL4 rear
turning socket NL4 front
2x M20 threads
6x transport handles
Steel grille with acoustic foam inside


Transport Protection Cover
hd SlientWheels Set
weather protection
RAL color