Just like the M4 I posted a couple weeks ago, (See it here)  this S5 owner needed more bass than the factory installed Bang & Oulfsen premium stereo could provide. This car came with an essentially useless donut spare tire so it was removed to make way for this dual Focal 10 inch custom subwoofer enclosure powered a Pioneer Digital Series Subwoofer Amplifier.

Tags: 9500ci, Laser, Radar, s5, Subwoofer, under floor