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d&b audiotechnik J-INFRA


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Product Overview

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 setups as well as arranged in an infra subwoofer array.

The J-INFRA is 2-way actively driven using both channels of the d&b D12 amplifier configured for the J-INFRA. More detailed information on specific loudspeaker setups with the D12 amplifier is available either in the relevant loudspeaker or D12 manual.



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 transport lid.

It has two bass reflex chambers containing three 21" drivers, two facing forward in one chamber that are driven from a channel of the D12 amplifier and one facing backwards driven by the other D12 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 highest accuracy in low frequency reproduction. Selecting Hypercardioid mode in the D12 optimizes the tuning of front and rear channels for a maximum rejection at the left and right sides behind the cabinet.


  • System data
  • Frequency response (–5 dB standard)    27 Hz - 60 Hz
  • Frequency response (–5 dB 70 Hz mode)    27 Hz - 70 Hz
  • Max. sound pressure (single cabinet, 1 m, free field)     141 dB
  • Loudspeaker data
  • Nominal impedance front/rear    3/6 ohms
  • Power handling capacity front (RMS/peak 10 ms)    500 W/2000 W
  • Power handling capacity rear (RMS/peak 10 ms)    600/2400 W
  • Components    3 x 21” driver
  • Connections    2 x NL4
                1 x EP5, optional 1 x NL8
  • Pin assignments
  • EP5    1: F+/2: F–/3: R+/4: R–/5: F SenseDrive2
  • NL8    1+: F+/1–: F–/4+: R+/4–: R–/3–: F SenseDrive2
  • Weight    152 kg (335 lb)

Product Downloads

  • J-INFRA J-Series Brochure PDF 8.5 MB
  • J-INFRA Mobile Sound Products Brochure PDF 4.8 MB
  • J-INFRA User Manual v2.1 PDF 0.7 MB


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*Prices are in AUD, include GST and are subject to change. Please call National Audio for pricing and availability on the J-INFRA.