d&b J-sub


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J subwoofer
The J-SUB is an actively driven 2-way bass-reflex design housing three long excursion neodymium 18″ drivers, two drivers face to the front and one driver to the rear. The cardioid dispersion pattern resulting from this approach avoids unwanted energy behind the system, which greatly reduces the reverberant field at low frequencies and provides the greatest accuracy of low frequency reproduction. J-SUB cabinets can be used to supplement J8 and J12 loudspeakers in various combinations, ground stacked or flown, either integrated on top of a J8 / J12 array or as a separate column. The J-SUB 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. Four 100 mm wheels and one EP5 or NL8 connector are mounted at the rear.


System data
Frequency response (–5 dB standard)
32 – 100 Hz
Frequency response (–5 dB INFRA mode)
32 – 70 Hz
Max. sound pressure (1m, free field)1
with 30D
with D80
138 dB SPL
139 dB SPL
Cabinets per D80/30D
Loudspeaker data
Large format flyable cardioid subwoofer
Nominal impedance
4 Ω (front) / 8 Ω (rear)
Power handling capacity (RMS/peak 10 ms) front
800/3200 W
Power handling capacity (RMS/peak 10 ms) rear
400/1600 W
3 x 18″ driver
1 x NLT4 F
optional 1 x EP5 or 1 x NL8
Dimensions, weight
Dimensions (H x W x D)
540 x 1100 x 9453 / 1063 mm
21.3 x 43.3 x 37.23 / 41.8″
106 kg
234 lb