The d&b audiotechnik B4 Subwoofer 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 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 cabinet is constructed from marine plywood, has an impact and weather-resistant paint finish, and has 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.
System data
Frequency response (–5 dB standard) 40 – 150 Hz
Frequency response (-5 dB 100 Hz mode) 40 – 100 Hz
Max. sound pressure (1m, free field)1
with D6/10D
with D20/30D
with D80 128 dB
131 dB
131 dB
Cabinets per amplifier channel 2
Loudspeaker data
Configuration Cardioid subwoofer
Nominal impedance 6 Ω
Power handling capacity (RMS/peak 10 ms) 500/2000 W
Components 15″ / 12″ driver
Connections 2 x NLT4 F/M
optional 2 x EP5 or 2 x NL4
Dimensions, weight
Dimensions (H x W x D) 476 x 580 x 7003 / 800 mm
18.7 x 22.8 x 27.73 / 31.6″
Weight 44 kg
97 lb
