The J-INFRA from d&b audiotechnik is the cardioid infra subwoofer for the J-Series. It is tuned to fit below the J-SUB subwoofer in terms of phase, sound, and impact and extends the frequency response of the system down to 27Hz. It is an actively driven two-way bass-reflex design housing three long excursion neodymium 21" drivers of which two face front while the other radiates to the rear. The two forward drivers are housed in a bass-reflex chamber and driven from a single channel of ...

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