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SP4 SERIES

SP4 Series

  • SP415
    $464.00 Choose Options SP415
    All US steel machined in house at Fi. The SP4 Series is the latest in the progression of Fi subwoofers geared towards thundering daily drivers. Starting with a monster 4" voicecoil for increase thermal capacity, we built...

  • SP418
    $494.00 Choose Options SP418
    All US steel machined in house at Fi. The SP4 Series is the latest in the progression of Fi subwoofers geared towards thundering daily drivers. Starting with a monster 4" voicecoil for increase thermal capacity, we built...