Focal ISUBBMW 4 - 8" Underseat 4-Ohm Subwoofer Kit for BMW 1, 3, 5, 6, 7 Series and X1 Z4 Sale Frequency response - 70Hz-20kHz

Frequency response - 70Hz-20kHz

The wrap-around aluminum heatsink keeps everything running cool

Water resistant black phenolic plastic

Pulse Width Modulated MOSFET power supply

Focal ISUBBMW 4 - 8" Underseat 4-Ohm Subwoofer Kit for BMW 1, 3, 5, 6, 7 Series and X1 Z4 Sale Frequency response - 70Hz-20kHzAdd a kick to your BMW Designed in Germany for the ultimate driving experience, you know your BMW will own the road. But if the bass from your factory subsystem isn't cutting it, add some Focal audio tech to the mix. The ISUB BMW 4 fits perfectly into the sub enclosure of select BMW models, providing a dramatic boost in the low frequencies of your music. Focal utilizes much of the same technology that they employ in their audiophile grade home