I have a 2012 Chrysler 200 with 6x9 speakers. Front doors r toast. Backs r good and so is dashboard speakers. Im upgrading to a Kenwood head unit and changing door speakers and had the factory infinity speakers given to me and sail tweeters out of a 2000 LHS. Can I still use the factory infinity speakers as a substitute for aftermarket speakers with out the amp? Yes I have the amp but not using it.