Ford Focus Subwoofer Specs and Replacement Options - YouTube
BASSER Ford Focus Mk2 - 10" Fit-Box Subwoofer Enclosure 17L
Quick SQ Build Log: 2014 Ford Focus ST: Morel, Mosconi, Arc, AM EVO 8" | DiyMobileAudio.com Car Stereo Forum | Ford focus st, Ford focus, Custom car audio