200 mm (8) hi-performance dedicated subwoofers for BMW built by the experts in sound: BLAM. This kit includes two 200mm (8) subwoofers which replace the standard 165mm original under seat woofers found on many BMWs and wiring harness adapters to make plugging them into the cars existing wiring extremely easy. This kit gives improved base a clearer, deeper sound when connected to the OEM sound system and will further upgrade the quality when paired with new door speakers, a new head unit or an amplifier. The rigid and light fiber glass membrane super powerful Neodymium motor give these subwoofers an edge over the rest. Max Power: 120 W / RMS Power: 60W. Frequency response: 40 Hz – 1 kHz. Sensitivity (2.83V/1m) 91 dB. Compatible with the following BMWs. 2-Series F22 and F23 (2014 onwards). 4-Series F32, F33 and F36 (2014 onwards).