Anyone know about car audio ?

[f1rob]

Not sure if this is the right place but cant find any other ?
Now f1 junior is about to turn 17 and has his first car and it seems the music system is as important as the car itself !
Now I can do any spannering on the car but audio is totally alien to me
One of my sons presents is a pair fusion (I think)6x9.s that are 310 watt
Now presume he needs a 2 channel amp ??? but what power ???
cheers for any help