D&B J-INFRA Subwoofer


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The J-INFRA is a cardioid infra subwoofer that can be used to supplement J-Series systems consisting of J8, J12, and J-SUB cabinets. It extends the frequency response of a J-Series system down to 27 Hz and can only be used in ground-stacked configurations in conventional left/right set-ups, as well as arranged in an infra subwoofer array. It has two bass-reflex chambers containing three 21″ drivers, two facing forward in one chamber that is driven from one channel of the d&b amplifier and one facing backward driven by another amplifier channel.

Through this driver setup, its cardioid dispersion pattern avoids unwanted energy behind the system and greatly reduces the reverberant field at low frequencies, providing the highest accuracy in low-frequency reproduction. Selecting Hypercardioid mode in the amplifier optimizes the tuning of the front and rear channels for a maximum rejection at the left and right sides behind the cabinet. The J-INFRA cabinet is constructed from marine plywood and has an impact and weather-protected PCP (Polyurea Cabinet Protection) finish. The front and rear of the loudspeaker cabinet are protected by a rigid metal grill and the side panels incorporate eight handles. The cabinet front is fitted with four catches for securing an optional wooden lid.


  • Item Name: Subwoofer
  • Components 3 x 21″
  • Dispersion Cardioid
  • SPLmax 144 dB
  • Weight 152 kg / 335 lb
  • d&b Certified Pre-Owned