Vibe BMW 1, 3, 4, 5, 6 Series & X1, X3 8 Underseat Car Bass Sub Subwoofers PAIR. 8woofer fits into the under-seat enclosure. System can be used as passive or semi-active system. 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. 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. Speaker Size 8 (200mm). RMS Power 115 watts. Peak Power 345 watts. Minimum Input (RMS) 55 watts. Frequency Response 55Hz – 25kHz. We do recommend to get the best perfomance out of these subwoofers a small amplifier should be added. The picture(s) in this listing are for illustration purposes only. The product design / style can vary due to alterations by suppliers during production. All our items that are sent out are checked before they are sent out to ensure all accessories are included and the item is fit for use. Please note BT, IV & JE postcodes, along with other non mainland areas will incur extra.