The B4-SUB features d&b audiotechnik's patented cardioid design, using one amplifier channel and building on CSA (cardioid subwoofer array) techniques the company began using in 2004. The cabinet houses two long-excursion neodymium drivers: a front-facing 15" driver in bass-reflex design and a 12" driver in a two-chamber bandpass design to the rear. The design reduces level behind the cabinet by more than 15dB over its operating bandwidth, providing high accuracy in its low frequency ...

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