What is the difference between the UG Opel F2.1 and F2.2? Permanently deleted user 15 July 2022 15:05 Updated The UG Opel F2.1 is WITH center speaker, the UG Opel F2.2 WITHOUT center speaker. Related articles Which speakers do I need for my Opel model? Which automatic on/off do I choose, SIG / DC or +12V Remote? Comments 0 comments Please sign in to leave a comment.