Please note the price shown is for a PAIR of subwoofers Fits the following vehicles BMW 1 Series F20 F21 BMW 3 Series F30 F31 F34 F35 BMW 4 Series F32 F33 BMW 5 Series F10 BMW 6 Series F12 F13 BMW X3 F25 ESOTERIC CONE Composite cone using paper, and wood fibres for a lightweight and rigid cone producing a natural vocal reproduction NEODYMIUM MOTOR All drivers feature powerful neodymium motors which deliver maximum magnetic force with shallow installation depth SHALLOW SUBWOOFER Custom tooled 8 inch subwoofer directly replaces the under seat installed factory speakers delivering improved bass performance Model OPTISOUNDBMW8-V4  Type Car Specific Component  Configuration 1-way  Speaker Size 8” (200mm)  RMS Power 115 watts  Peak Power 345 watts  Minimum Input (RMS) 55 watts  Sensitivity 90dB  Frequency Response 55Hz - 25kHz  Impedance 4ohm