u/Inner_Film_5736

So one of my current speakers in my car has been failing so since i’ve kinda upgraded a lot of stuff already i’m thinking to just buy a whole new system, but when i google about it some say i need just 2 pairs of speakers front and back and then some say 7? where do the additional 3 go??

Im very new to car upgrading in general let alone car audio
i have a 2007 civic EX any type of help would be appreciated !
(also if any brands are good let me know! i’m down to spend about 200-400