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d&b audiotechnik B4-SUB


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Product Overview

The B4-SUB is an actively driven cardioid subwoofer powered by a single amplifier channel. It houses two long excursion neodymium drivers in an integrated cardioid setup: a 15" driver in a bass-reflex design facing to the front and a 12" driver in a two chamber bandpass design radiating to the rear. The cardioid dispersion pattern resulting from this approach avoids unwanted energy behind the system that greatly reduces the reverberant field at low frequencies and provides the greatest accuracy of low frequency reproduction. The B4 subwoofer can only be used in a ground stacked setup.

The B4-SUB can be driven either by the d&b D6 or D12 dual channel power amplifiers configured for the B4-SUB. More detailed information on specific loudspeaker setups with d&b amplifiers is available either in the relevant loudspeaker or amplifier manuals.



The B4-SUB cabinet is constructed from marine plywood, has an impact and weather resistant paint finish and a pair of handles. An M20 threaded flange in the top panel accepts the d&b Loudspeaker stand winder M20. The loudspeaker cabinet is also available in Special Colour (SC) options.


  • Components     Front 15" driver, Rear 12" driver
  • Max. sound pressure (1 m, free field) with D6 / D12     128 / 131 dB SPL
  • Power handling capacity (RMS / peak 10 ms)     500 / 2000 W
  • Frequency response (-5 dB)     40 Hz - 150 / 100 Hz
  • Cabinets per channel D6 / D12     2 / 2
  • Dimensions mm (h x w x d)     476 x 580 x 800 / 700
  • Weight kg     4

Product Downloads

  • B4-SUB E-Series Brochure PDF 6.9 MB
  • B4-SUB User Manual v1.1 PDF 0.1 MB
  • B4-SUB T-Series Brochure PDF 9.1 MB
  • B4-SUB Mobile Sound Products Brochure PDF 4.8 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 B4-SUB.