BMW E46 cabrio/convertible Audio Upgrade - YouTube
Basser - FBbmw05 BMW 3 E46 Cabrio Fit-Box subwoofer enclosure
BMW E46 Convertible Hertz ESF20.5 8” Car Subwoofer installation in custom box and Hertz HCP2 Amplifier to drive the subwoofer. Really great sounding bass... | By In Car Music | Facebook
E46 M3 Convertible/Cabriolet | Keep 3 8" custom sub box? If yes, what new drivers? | DIYMobileAudio.com Car Stereo Forum