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Amplifiers. Applications. Data. Downloads. Documentation. Accessories. B4-SUB 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 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. Amplifiers The B4-SUB can be driven either by d&b's 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 Applications Live-music   Playback   Speech   Stage monitor   Subwoofer Data 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 44 Dimensions inch (h x w x d) 18.7 x 22.8 x 31.6 / 27.7 Weight lb 97 Application information is presented for guidance only. We reserve the right to make any necessary changes to the products and the published specification. As part of our ongoing product development program we try, where possible, to maintain the highest degree of product compatibility.    recommended use    SPL max peak, test signal: pink noise with crest factor 4    100 Hz mode    dimensions without wheels Top of the page. Downloads CAD drawings 2D/3D Documentation PDF Title Language Date Size B4-SUB Manual 1.1 English 01.07.10 147 kB Declaration of Conformity Loudspeaker/Amplifiers (CE) Int 14.10.09 25 kB The E-Series brochure English 22.03.10 3157 kB The T-Series brochure English 22.03.10 2235 kB Order form for printed documentation from d&b. Accessories Available PDF documents for the accessories can be found in the table below the images. Z5013 Loudspeaker stand winder M20 E7922 B4-SUB Wooden lid   Top. Feedback.