Rockford Fosgate. Rockford Fosgate R250X1, Parallel @2ohms. Rockford Fosgate P300X1, Parallel @2ohms. Rockford Fosgate PBR500X1, Parallel @2ohms. Rockford Fosgate P500X1BD, Parallel @2ohms. Rockford Fosgate R1200-1D, Series/Parallel @4 ohms.
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