6x9's - fuck em off

The BEST and ONLY type of system you need in a car is a set of GOOD front components (mid range/tweeters) and a powerful sub in the boot.

NO rear speakers at all apart from the sub.

If powered correctly, it will fill the car with music and still have the sub for lows.

DONT get a sub in the boot with 6x9's on the parcel shelf

I recommend JL Audio subwoofers and JL Audio amplifiers, and the front components I run are Alpines.